diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 84a672cb0e..02264ea4e5 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -12347,7 +12347,7 @@ wildtrigger()						*wildtrigger()*
 						*cmdline-autocompletion*
 		Example: To make the completion menu pop up automatically as
 		you type on the command line, use: >
-			autocmd CmdlineChanged [:/?] call wildtrigger()
+			autocmd CmdlineChanged [:/\?] call wildtrigger()
 			set wildmode=noselect:lastused,full wildoptions=pum
 <
 		To retain normal history navigation (up/down keys): >