diff --git a/ChangeLog b/ChangeLog
index cf52a1e4d..7d21a69ac 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-06-01  Peter Stephenson  <p.w.stephenson@ntlworld.com>
+
+	* 25127: README: note the changes in 25124 and 25126 as
+	an incompatibility.
+
 2008-06-01  Clint Adams  <clint@zsh.org>
 
 	* 25124, 25126: INSTALL, MACHINES, configure.ac, Src/zsh.h: work
diff --git a/README b/README
index 027865509..5375eb3a5 100644
--- a/README
+++ b/README
@@ -32,7 +32,14 @@ details, see the documentation.
 Possible incompatibilities
 ---------------------------
 
-Since 4.2:
+This section documents incompatibilities in the shell since the 4.2
+series of releases.
+
+The configuration option --enable-lfs to enable large file support has
+been replaced by autoconf's standard --enable-largefile mechanism.
+As this is usually used whenever necessary, this won't usually
+be noticeable; however, anyone configuring with --disable-lfs
+should configure with --disable-largefile instead.
 
 The configuration option --with-curses-terminfo has been replaced
 by the option --with-term-lib="LIBS" where LIBS is a space-separated