[ci skip] Add changelog entry for PR #3968
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index d431d49..b7888ca 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -55,6 +55,7 @@
- Fixed a bug (#3955) - :doc:`Cache Library <libraries/caching>` methods ``increment()`` and ``decrement()`` ignored the 'key_prefix' setting.
- Fixed a bug (#3963) - :doc:`Unit Testing Library <libraries/unit_testing>` wrongly tried to translate filenames, line numbers and notes values in test results.
- Fixed a bug (#3965) - :doc:`File Uploading Library <libraries/file_uploading>` ignored the "encrypt_name" setting when "overwrite" is enabled.
+- Fixed a bug (#3968) - :doc:`Database Forge <database/forge>` method ``add_key()`` didn't treat array inputs as composite keys unless it's a PRIMARY KEY.
Version 3.0.0
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