diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 827b1f0..cf0d29f 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -51,6 +51,7 @@
    -  Path constants BASEPATH, APPPATH and VIEWPATH are now (internally) defined as absolute paths.
    -  Updated email validation methods to use ``filter_var()`` instead of PCRE.
    -  Changed environment defaults to report all errors in 'development' and only fatal ones in 'testing' and 'production' but only display them in 'development'.
+   -  Updated ip_address lengths from 16 to 45 for supporting ipv6 address on trackback library and captcha helper.
 
 -  Helpers