diff --git a/ChangeLog b/ChangeLog
index b89daa43b..6d6d61d64 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,10 @@
 	don't mistake this for a real leak.
 	Patch by Dennis Smit <ds@nerds-incorporated.org.
 
+2003-11-04  Paul Eggert  <eggert@twinsun.com>
+
+	* README: Document _POSIX2_VERSION.
+
 2003-11-04  Jim Meyering  <jim@meyering.net>
 
 	* src/tac.c (memrchr): Remove #if-0'd function.