diff --git a/doc/filters.texi b/doc/filters.texi
index 3edf3f50b0..8eff460cd9 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -22989,6 +22989,7 @@ Default transition effect is fade.
 
 @item duration
 Set cross fade duration in seconds.
+Range is 0 to 60 seconds.
 Default duration is 1 second.
 
 @item offset