diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 5c799dc19097201b08c3d10c42a1d234cf65581b..ce50053f49e9e07e3d042805c6ccaab1a9ed85dc 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -297,7 +297,9 @@ typedef struct AVOutputFormat {
     int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
     int (*write_trailer)(struct AVFormatContext *);
     /**
-     * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER
+     * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
+     * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
+     * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS
      */
     int flags;
     /**