diff --git a/libavcodec/atrac.c b/libavcodec/atrac.c
index 141248f54d..f960ffc594 100644
--- a/libavcodec/atrac.c
+++ b/libavcodec/atrac.c
@@ -1,5 +1,5 @@
 /*
- * Common functions for the ATRAC family of decoders
+ * common functions for the ATRAC family of decoders
  *
  * Copyright (c) 2006-2013 Maxim Poliakovski
  * Copyright (c) 2006-2008 Benjamin Larsson
diff --git a/libavcodec/atrac.h b/libavcodec/atrac.h
index e47d4ca18d..c389256723 100644
--- a/libavcodec/atrac.h
+++ b/libavcodec/atrac.h
@@ -1,5 +1,5 @@
 /*
- * Common functions for the ATRAC family of decoders
+ * common functions for the ATRAC family of decoders
  *
  * Copyright (c) 2009-2013 Maxim Poliakovski
  * Copyright (c) 2009 Benjamin Larsson