[ci skip] Add a changelog entry for class file naming rule change
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index efbe860..2bd34c3 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -19,6 +19,7 @@
- General Changes
- PHP 5.1.6 is no longer supported. CodeIgniter now requires PHP 5.2.4.
+ - Changed filenaming convention (class file names now must be Ucfirst and everything else in lowercase).
- ``$_SERVER['CI_ENV']`` can now be set to control the ``ENVIRONMENT`` constant.
- Added an optional backtrace to php-error template.
- Added Android to the list of user agents.