diff --git a/libavfilter/vsrc_buffer.h b/libavfilter/vsrc_buffer.h
index 6867f81e1c..cfaf7919ac 100644
--- a/libavfilter/vsrc_buffer.h
+++ b/libavfilter/vsrc_buffer.h
@@ -22,6 +22,11 @@
 #ifndef AVFILTER_VSRC_BUFFER_H
 #define AVFILTER_VSRC_BUFFER_H
 
+/**
+ * @file
+ * memory buffer source API for video
+ */
+
 #include "libavcodec/avcodec.h" /* AVFrame */
 #include "avfilter.h"