diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 40ba81b01e..728dd6622b 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -546,7 +546,7 @@ typedef struct AVStream {
 #endif
 
     /**
-     * Decoding: pts of the first frame of the stream, in stream time base.
+     * Decoding: pts of the first frame of the stream in presentation order, in stream time base.
      * Only set this if you are absolutely 100% sure that the value you set
      * it to really is the pts of the first frame.
      * This may be undefined (AV_NOPTS_VALUE).