[ci skip] Fix #5590 (add a default error message for FV valid_base64 rule)
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index aa0eae7..5e72982 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -18,6 +18,7 @@
- Fixed a bug (#5545) - :doc:`Session Library <libraries/sessions>` crashed due to a caching-related error with the 'files' driver.
- Fixed a bug (#5571) - :doc:`XML-RPC Library <libraries/xmlrpc>` had a typo that triggered an ``E_WARNING`` message on PHP 7.2.
- Fixed a bug (#5587) - :doc:`Database Forge <database/forge>` method ``create_table()`` generated an ``E_WARNING`` message.
+- Fixed a bug (#5590) - :doc:`Form Validation Library <libraries/form_validation>` rule **valid_base64** didn't have a default error message.
Version 3.1.9
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