diff --git a/runtime/doc/testing.txt b/runtime/doc/testing.txt
index 7e8e8b9..f251781 100644
--- a/runtime/doc/testing.txt
+++ b/runtime/doc/testing.txt
@@ -186,6 +186,7 @@
 				    keyup   generate a keyup event
 				    keydown generate a keydown event
 		    keycode:    Keycode to use for a keyup or a keydown event.
+								*E1291*
 
 		"tabline":
 		  Inject a mouse click event on the tabline to select a