diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
index 71f60d6961..e69d4955ce 100644
--- a/doc/src/sgml/release-12.sgml
+++ b/doc/src/sgml/release-12.sgml
@@ -2965,10 +2965,24 @@ Author: Andres Freund <andres@anarazel.de>
        Require a C99-supported compiler, and <acronym>MSVC</acronym>
        2013 or later on <productname>Windows</productname> (Andres Freund)
       </para>
      </listitem>
 
+     <listitem>
+<!--
+Author: Michael Paquier <michael@paquier.xyz>
+2018-09-14 [0ba06e0bf] Allow concurrent-safe open() and fopen() in frontend
+2018-09-20 [40cfe8606] Enforce translation mode for Windows frontends to text
+-->
+
+      <para>
+       Use the same functions to open files in frontend and backend code
+       on <productname>Windows</productname>, thus fixing the "open_datasync"
+       test in "pg_test_fsync" (Laurenz Albe)
+      </para>
+     </listitem>
+
     </itemizedlist>
 
    </sect3>
 
    <sect3>