diff --git a/completion/_ubanner b/completion/_ubanner
index a358c9c..86d7be1 100644
--- a/completion/_ubanner
+++ b/completion/_ubanner
@@ -9,7 +9,7 @@ _arguments -s -S \
   '--trim[trim leading/trailing empty lines]' \
   {-f,--font}'[use this fontface]:fontname:->fonts' \
   {-s,--font-size}'[font size in pixels (default: 28)]:size:(28 36 42 50 58 64 72 80 88 96)' \
-  {-S,--full-screen}'[full screen mode]'
+  {-S,--full-screen}'[max font size to fit terminal window]'
 
 case "$state" in
   fonts)