diff --git a/docs/Changelog.md b/docs/Changelog.md
index 0689e17..ead6b2a 100644
--- a/docs/Changelog.md
+++ b/docs/Changelog.md
@@ -225,3 +225,14 @@
 ## Bugfixes
 
 * Creating a new game no longer marks all other games of the same owner as updated, allowing them to be cleaned up properly.
+
+# v3.1.1 (2024-07-15)
+
+## Bugfixes
+
+* The `PATCH .../empires/:empire` endpoint with `free=true` now correctly updates the empire's resources.
+* The `UpdateSystemDto` now accepts the `effects` property.
+
+## Documentation
+
+* Documented the System `type` property correctly.