diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 6f38bc0..86a734f 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -9253,6 +9253,8 @@
 	The character is not recognized when used inside a macro.  See
 	'wildcharm' for that.
 	Some keys will not work, such as CTRL-C, <CR> and Enter.
+	<Esc> can be used, but hitting it twice in a row will still exit
+	command-line as a failsafe measure.
 	Although 'wc' is a number option, you can set it to a special key: >
 		:set wc=<Tab>
 <	NOTE: This option is set to the Vi default value when 'compatible' is