diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 621e3ed..e004010 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -864,6 +864,9 @@
 				plugin. You can always use `:noa` to prevent
 				triggering this autocommand.
 
+				When using |:set| in the autocommand the event
+				is not triggered again.
+
 							*QuickFixCmdPre*
 QuickFixCmdPre			Before a quickfix command is run (|:make|,
 				|:lmake|, |:grep|, |:lgrep|, |:grepadd|,