diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 8ae8992127..8020582b6e 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2626,7 +2626,7 @@ typedef struct AVCodecContext {
 
     /**
      * Set by the client if its custom get_buffer() callback can be called
-     * from another thread, which allows faster multithreaded decoding.
+     * synchronously from another thread, which allows faster multithreaded decoding.
      * draw_horiz_band() will be called from other threads regardless of this setting.
      * Ignored if the default get_buffer() is used.
      * - encoding: Set by user.