diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index 31feaf5..83f50f1 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -1,4 +1,4 @@
-*change.txt*    For Vim version 7.0aa.  Last change: 2005 Jun 16
+*change.txt*    For Vim version 7.0aa.  Last change: 2005 Jun 25
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1527,4 +1527,8 @@
 Note that using ":sort" with ":global" doesn't sort the matching lines, it's
 quite useless.
 
+The details about sorting depend on the library function used.  There is no
+guarantee that sorting is "stable" or obeys the current locale.  You will have
+to try it out.
+
  vim:tw=78:ts=8:ft=help:norl: