1 files changed, 3 insertions, 3 deletions
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 3dfbf6468c..8dab2b75e7 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1237,9 +1237,9 @@ typedef struct AVFormatContext {
     /**
      * A callback for opening new IO streams.
      *
-     * Certain muxers or demuxers (e.g. for various playlist-based formats) need
-     * to open additional files during muxing or demuxing. This callback allows
-     * the caller to provide custom IO in such cases.
+     * Whenever a muxer or a demuxer needs to open an IO stream (typically from
+     * avformat_open_input() for demuxers, but for certain formats can happen at
+     * other times as well), it will call this callback to obtain an IO context.
      *
      * @param s the format context
      * @param pb on success, the newly opened IO context should be returned here