diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 3ac8e5d..5f1c4a6 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1,4 +1,4 @@
-*map.txt*       For Vim version 7.4.  Last change: 2014 Jun 02
+*map.txt*       For Vim version 7.4.  Last change: 2014 Sep 30
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1283,6 +1283,8 @@
 	-complete=custom,{func} custom completion, defined via {func}
 	-complete=customlist,{func} custom completion, defined via {func}
 
+Note: That some completion methods might expand environment variables.
+
 
 Custom completion			*:command-completion-custom*
 					*:command-completion-customlist*