diff --git a/changelog.txt b/changelog.txt
index 9a32a07e..557b4ec0 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -11,6 +11,13 @@ http://www.ietf.org/rfc/rfc2255.txt
 http://www.ietf.org/rfc/rfc2256.txt
 http://www.ietf.org/rfc/rfc2696.txt
 
+Changes in version 1.3.1 (Fall 2009)
+-------------------------------------------
+* Added utility methods for converting a Windows security identifier (SID)
+  between a binary format and a slightly more readable string format.
+  http://msdn.microsoft.com/en-us/library/aa379571%28VS.85%29.aspx
+  (LDAP-187)
+
 Changes in version 1.3.0 (Jan 2009)
 -------------------------------------------
 * Added methods for simple LDAP 'bind' authentication in LdapOperations and