diff --git a/reftable/basics.c b/reftable/basics.c
index 8c4a4433e41..9988ebd635e 100644
--- a/reftable/basics.c
+++ b/reftable/basics.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #define REFTABLE_ALLOW_BANNED_ALLOCATORS
 #include "basics.h"
diff --git a/reftable/basics.h b/reftable/basics.h
index fd59cbb7720..96a2f0d3829 100644
--- a/reftable/basics.h
+++ b/reftable/basics.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef BASICS_H
 #define BASICS_H
diff --git a/reftable/block.c b/reftable/block.c
index 53b5e044690..a5734d44415 100644
--- a/reftable/block.c
+++ b/reftable/block.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "block.h"
 
diff --git a/reftable/block.h b/reftable/block.h
index bef2b8a4c5c..eaeffdffc90 100644
--- a/reftable/block.h
+++ b/reftable/block.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef BLOCK_H
 #define BLOCK_H
diff --git a/reftable/blocksource.c b/reftable/blocksource.c
index 78c1be23373..1397cbe7800 100644
--- a/reftable/blocksource.c
+++ b/reftable/blocksource.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "system.h"
 
diff --git a/reftable/blocksource.h b/reftable/blocksource.h
index a84a3ccd891..7b67898ae22 100644
--- a/reftable/blocksource.h
+++ b/reftable/blocksource.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef BLOCKSOURCE_H
 #define BLOCKSOURCE_H
diff --git a/reftable/constants.h b/reftable/constants.h
index f6beb843ebf..091728cf033 100644
--- a/reftable/constants.h
+++ b/reftable/constants.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef CONSTANTS_H
 #define CONSTANTS_H
diff --git a/reftable/error.c b/reftable/error.c
index 660d0296170..c7cab2dbc42 100644
--- a/reftable/error.c
+++ b/reftable/error.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "system.h"
 #include "reftable-error.h"
diff --git a/reftable/iter.c b/reftable/iter.c
index f520382e700..44a155e756e 100644
--- a/reftable/iter.c
+++ b/reftable/iter.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "iter.h"
 
diff --git a/reftable/iter.h b/reftable/iter.h
index 40f98893b85..bd217405f55 100644
--- a/reftable/iter.h
+++ b/reftable/iter.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef ITER_H
 #define ITER_H
diff --git a/reftable/merged.c b/reftable/merged.c
index 4ff1553772a..1829a081756 100644
--- a/reftable/merged.c
+++ b/reftable/merged.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "merged.h"
 
diff --git a/reftable/merged.h b/reftable/merged.h
index 0b7d939e92b..ae92409d342 100644
--- a/reftable/merged.h
+++ b/reftable/merged.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef MERGED_H
 #define MERGED_H
diff --git a/reftable/pq.c b/reftable/pq.c
index 82394a972db..9a79f5c5eec 100644
--- a/reftable/pq.c
+++ b/reftable/pq.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "pq.h"
 
diff --git a/reftable/pq.h b/reftable/pq.h
index ff39016445b..42310670b09 100644
--- a/reftable/pq.h
+++ b/reftable/pq.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef PQ_H
 #define PQ_H
diff --git a/reftable/reader.c b/reftable/reader.c
index 172aff2c10b..155a26c30ff 100644
--- a/reftable/reader.c
+++ b/reftable/reader.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "reader.h"
 
diff --git a/reftable/reader.h b/reftable/reader.h
index bb72108a6f1..c9dccbd6c97 100644
--- a/reftable/reader.h
+++ b/reftable/reader.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef READER_H
 #define READER_H
diff --git a/reftable/record.c b/reftable/record.c
index 142853d5070..26cd834d405 100644
--- a/reftable/record.c
+++ b/reftable/record.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 /* record.c - methods for different types of records. */
 
diff --git a/reftable/record.h b/reftable/record.h
index 867810a9328..7953f352a3c 100644
--- a/reftable/record.h
+++ b/reftable/record.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef RECORD_H
 #define RECORD_H
diff --git a/reftable/reftable-basics.h b/reftable/reftable-basics.h
index e0397ed5836..ed7c7c9ac2c 100644
--- a/reftable/reftable-basics.h
+++ b/reftable/reftable-basics.h
@@ -4,7 +4,7 @@
  * Use of this source code is governed by a BSD-style
  * license that can be found in the LICENSE file or at
  * https://developers.google.com/open-source/licenses/bsd
-*/
+ */
 
 #ifndef REFTABLE_BASICS_H
 #define REFTABLE_BASICS_H
diff --git a/reftable/reftable-blocksource.h b/reftable/reftable-blocksource.h
index 6b326aa5ea5..8692cd017e9 100644
--- a/reftable/reftable-blocksource.h
+++ b/reftable/reftable-blocksource.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_BLOCKSOURCE_H
 #define REFTABLE_BLOCKSOURCE_H
diff --git a/reftable/reftable-error.h b/reftable/reftable-error.h
index a7e33d964d0..d100e0df927 100644
--- a/reftable/reftable-error.h
+++ b/reftable/reftable-error.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_ERROR_H
 #define REFTABLE_ERROR_H
diff --git a/reftable/reftable-iterator.h b/reftable/reftable-iterator.h
index e3bf688d53d..af582028c27 100644
--- a/reftable/reftable-iterator.h
+++ b/reftable/reftable-iterator.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_ITERATOR_H
 #define REFTABLE_ITERATOR_H
diff --git a/reftable/reftable-merged.h b/reftable/reftable-merged.h
index f2d01c3ef82..445756e475a 100644
--- a/reftable/reftable-merged.h
+++ b/reftable/reftable-merged.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_MERGED_H
 #define REFTABLE_MERGED_H
diff --git a/reftable/reftable-reader.h b/reftable/reftable-reader.h
index 0085fbb9032..9b6a8ac0716 100644
--- a/reftable/reftable-reader.h
+++ b/reftable/reftable-reader.h
@@ -1,10 +1,10 @@
 /*
-  Copyright 2020 Google LLC
-
-  Use of this source code is governed by a BSD-style
-  license that can be found in the LICENSE file or at
-  https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_READER_H
 #define REFTABLE_READER_H
diff --git a/reftable/reftable-record.h b/reftable/reftable-record.h
index 931e5947441..385a74cc864 100644
--- a/reftable/reftable-record.h
+++ b/reftable/reftable-record.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_RECORD_H
 #define REFTABLE_RECORD_H
diff --git a/reftable/reftable-stack.h b/reftable/reftable-stack.h
index ae14270ea74..910ec6ef3a2 100644
--- a/reftable/reftable-stack.h
+++ b/reftable/reftable-stack.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_STACK_H
 #define REFTABLE_STACK_H
diff --git a/reftable/reftable-writer.h b/reftable/reftable-writer.h
index 1befe3b07cf..0fbeff17f46 100644
--- a/reftable/reftable-writer.h
+++ b/reftable/reftable-writer.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef REFTABLE_WRITER_H
 #define REFTABLE_WRITER_H
diff --git a/reftable/stack.c b/reftable/stack.c
index 6dac015b473..bc3cfa91170 100644
--- a/reftable/stack.c
+++ b/reftable/stack.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "stack.h"
 
diff --git a/reftable/stack.h b/reftable/stack.h
index 5b45cff4f75..d91f5ce6072 100644
--- a/reftable/stack.h
+++ b/reftable/stack.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef STACK_H
 #define STACK_H
diff --git a/reftable/system.h b/reftable/system.h
index 10055fbff2d..cf207aa0c53 100644
--- a/reftable/system.h
+++ b/reftable/system.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef SYSTEM_H
 #define SYSTEM_H
diff --git a/reftable/tree.c b/reftable/tree.c
index f4dbe720901..a52f7c0c7d4 100644
--- a/reftable/tree.c
+++ b/reftable/tree.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "system.h"
 #include "tree.h"
diff --git a/reftable/tree.h b/reftable/tree.h
index 9604453b6d5..2c9c4652994 100644
--- a/reftable/tree.h
+++ b/reftable/tree.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef TREE_H
 #define TREE_H
diff --git a/reftable/writer.c b/reftable/writer.c
index ce55a1deb06..f0accfd0c32 100644
--- a/reftable/writer.c
+++ b/reftable/writer.c
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #include "writer.h"
 
diff --git a/reftable/writer.h b/reftable/writer.h
index 1f4788a430c..9f53610b27a 100644
--- a/reftable/writer.h
+++ b/reftable/writer.h
@@ -1,10 +1,10 @@
 /*
-Copyright 2020 Google LLC
-
-Use of this source code is governed by a BSD-style
-license that can be found in the LICENSE file or at
-https://developers.google.com/open-source/licenses/bsd
-*/
+ * Copyright 2020 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
 
 #ifndef WRITER_H
 #define WRITER_H
