diff --git a/lustre/ChangeLog b/lustre/ChangeLog
index 7a20a8fc71fdb4516a2ff8c2f9cb00569db98f38..63701475b85184db6ae9240fae9007e3af34f50f 100644
--- a/lustre/ChangeLog
+++ b/lustre/ChangeLog
@@ -158,6 +158,12 @@ Details    : fix stack overflow in the distributed lock manager by defering expo
 	     eviction after a failed ast to the elt thread instead of handling
 	     it in the dlm interpret routine.
 
+Severity   : enhancement
+Bugzilla   : 12800
+Description: More exported tunables for mballoc
+Details    : Add support for tunable preallocation window and new tunables for
+             large/small requests
+
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 2008-08-31 Sun Microsystems, Inc.