[ci skip] Add changelog entry for #4754
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 8e04795..7527048 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -16,6 +16,7 @@
- Fixed a regression (#4736) - :doc:`Image Manipulation Library <libraries/image_lib>` processing via ImageMagick didn't work.
- Fixed a bug (#4737) - :doc:`Query Builder <database/query_builder>` didn't add an ``OFFSET`` when ``LIMIT`` is zero or unused.
- Fixed a regression (#4739) - :doc:`Email Library <libraries/email>` doesn't properly separate attachment bodies from headers.
+- Fixed a bug (#4754) - :doc:`Unit Testing Library <libraries/unit_testing>` method ``result()`` didn't translate ``res_datatype``.
Version 3.1.0
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