diff --git a/ChangeLog b/ChangeLog
index 7399cad..e22fdee 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -54,6 +54,8 @@
    * Fixed the templates used to generate project and solution files for Visual
      Studio 2015 as well as the files themselves, to remove a build warning
      generated in Visual Studio 2015. Reported by Steve Valliere. #742
+   * Fix a resource leak in ssl_cookie, when using MBEDTLS_THREADING_C.
+     Raised and fix suggested by Alan Gillingham in the mbed TLS forum. #771
 
 = mbed TLS 2.4.1 branch released 2016-12-13