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+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Changes since v3.1.0
 
+- [#110](https://github.com/pusher/oauth2_proxy/pull/110) Added GCP healthcheck option (@timothy-spencer)
 - [#63](https://github.com/pusher/oauth2_proxy/pull/63) Use encoding/json for SessionState serialization (@yaegashi)
   - Use JSON to encode session state to be stored in browser cookies
   - Implement legacy decode function to support existing cookies generated by older versions