Update changelog.
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-# #develop#
+# 5.0.0
- TODO: Enumerate changes.
+This major change introduces a breaking API change for Swift clients.
+## Breaking changes
+
+**Swift only**: The UIViewController extension property `transitionController` has been renamed to `mdm_transitionController`.
+
+## Source changes
+
+* [[breaking] Rename the transitionController Swift API to mdm_transitionController. (#59)](https://github.com/material-motion/motion-transitioning-objc/commit/7b3f0c28bc43ed25248fad2e197228fc815b0909) (featherless)
+
+## API changes
+
+### UIViewController
+
+**renamed (swift)** method: `transitionController` to `mdm_transitionController`.
# 4.0.2
