diff --git a/help.md b/help.md
index 6972c94..cee90df 100644
--- a/help.md
+++ b/help.md
@@ -241,6 +241,9 @@ cycle style of editing.
 - Ctrl-F10 =>
         Toggle visible whitespace mode
 
+- Alt-F10 =>
+        Change gutter mode
+
 ### Language Server Commands
 
 - F12 =>