diff --git a/CHANGES.md b/CHANGES.md
index 80a698b6..d65633b5 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,10 @@
 # Changes
 
 This document describes the relevant changes between releases of the API model.
+
+## 0.0.319 September 15 2023
+- Add `AdditionalComputeSecurityGroupIds` to `STS` and `AWS Machine Pool` types
+
 ## 0.0.318 September 11 2023
 - Add `ImageOverrides` to `Version` type