diff --git a/src/extrapolater.c b/src/extrapolater.c
index 22b0f12..c976be5 100644
--- a/src/extrapolater.c
+++ b/src/extrapolater.c
@@ -1,3 +1,7 @@
+/* 
+ * Copyright (C) 2013 nu774
+ * For conditions of distribution and use, see copyright notice in COPYING
+ */
 #if HAVE_CONFIG_H
 #  include "config.h"
 #endif
diff --git a/src/metadata.c b/src/metadata.c
index 9781b37..49781b2 100644
--- a/src/metadata.c
+++ b/src/metadata.c
@@ -1,3 +1,7 @@
+/* 
+ * Copyright (C) 2013 nu774
+ * For conditions of distribution and use, see copyright notice in COPYING
+ */
 #if HAVE_CONFIG_H
 #  include "config.h"
 #endif
diff --git a/src/metadata.h b/src/metadata.h
index 0438b79..a832d23 100644
--- a/src/metadata.h
+++ b/src/metadata.h
@@ -1,3 +1,7 @@
+/* 
+ * Copyright (C) 2013 nu774
+ * For conditions of distribution and use, see copyright notice in COPYING
+ */
 #ifndef METADATA_H
 #define METADATA_H
 
diff --git a/src/pcm_reader.h b/src/pcm_reader.h
index ba998e3..1dfef34 100644
--- a/src/pcm_reader.h
+++ b/src/pcm_reader.h
@@ -1,3 +1,7 @@
+/* 
+ * Copyright (C) 2013 nu774
+ * For conditions of distribution and use, see copyright notice in COPYING
+ */
 #ifndef PCM_READER_H
 #define PCM_READER_H
 
diff --git a/src/pcm_sint16_converter.c b/src/pcm_sint16_converter.c
index da31239..f4a7ad6 100644
--- a/src/pcm_sint16_converter.c
+++ b/src/pcm_sint16_converter.c
@@ -1,3 +1,7 @@
+/* 
+ * Copyright (C) 2013 nu774
+ * For conditions of distribution and use, see copyright notice in COPYING
+ */
 #if HAVE_CONFIG_H
 #  include "config.h"
 #endif