diff --git a/winsup/cygwin/release/2.5.1 b/winsup/cygwin/release/2.5.1
index d0331fbd5..c9d3b613d 100644
--- a/winsup/cygwin/release/2.5.1
+++ b/winsup/cygwin/release/2.5.1
@@ -16,3 +16,7 @@ Bug Fixes
 - 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
+
+- Remove spurious checks for already initialized pthread object in pthread
+  object init functions.
+  Addresses: https://cygwin.com/ml/cygwin/2016-04/msg00473.html