diff --git a/RELEASE.md b/RELEASE.md
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+++ b/RELEASE.md
@@ -1,5 +1,12 @@
 # Release notes
 
+### 2025.10.27
+
+Features: 
+
+- max_sum_2x2 including index of subcluster with highest energy is now available from Python API 
+- eta stores corner as enum class cTopLeft, cTopRight, BottomLeft, cBottomRight indicating 2x2 subcluster with largest energy relative to cluster center 
+
 ### 2025.10.1
 
 Bugfixes: