diff --git a/winsup/cygwin/release/2.5.1 b/winsup/cygwin/release/2.5.1
index b770ad86e..d0331fbd5 100644
--- a/winsup/cygwin/release/2.5.1
+++ b/winsup/cygwin/release/2.5.1
@@ -12,3 +12,7 @@ Bug Fixes
 - Fix strxfrm/wcsxfrm return value if output buffer is too small.  Fix
   wcsxfrm return value either way.
   Addresses: https://cygwin.com/ml/cygwin/2016-04/msg00232.html
+
+- Fix bug introduced in 2.5.0: Fix condition specifying when to write a
+  NULL SID ACE.
+  Addresses: https://cygwin.com/ml/cygwin/2016-04/msg00400.html