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-rw-r--r--libavformat/avformat.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 21c282a100..e91e7f1d33 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -2189,7 +2189,8 @@ uint8_t *av_stream_new_side_data(AVStream *stream,
*
* @param stream stream
* @param type desired side information type
- * @param size pointer for side information size to store (optional)
+ * @param size If supplied, *size will be set to the size of the side data
+ * or to zero if the desired side data is not present.
* @return pointer to data if present or NULL otherwise
*/
uint8_t *av_stream_get_side_data(const AVStream *stream,