diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 28de79a..152728f 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt*	For Vim version 7.0aa.  Last change: 2004 Sep 01
+*syntax.txt*	For Vim version 7.0aa.  Last change: 2004 Sep 13
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -4014,6 +4014,11 @@
 	  highlight comment ctermfg=green guifg=green
 	endif
 
+								*E679*
+Do make sure this syncolor.vim script does not use a "syntax on", set the
+'background' option or uses a "colorscheme" command, because it results in an
+endless loop.
+
 Note that when a color scheme is used, there might be some confusion whether
 your defined colors are to be used or the colors from the scheme.  This
 depends on the color scheme file.  See |:colorscheme|.