diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1
index 05d4ae32d0..cffa8812cd 100644
--- a/DOCS/man/en/mplayer.1
+++ b/DOCS/man/en/mplayer.1
@@ -8189,7 +8189,8 @@ Any other framerate is incompatible with this option.
 .
 .TP
 .B format=<container_format>
-Select which container format to mux into (no default).
+Override which container format to mux into
+(default: autodetect from output file extension).
 .
 .
 .\" --------------------------------------------------------------------------