diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 8089a95..f9817e7 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+### 5.3.0-prerelease008
+- fix part index handling in JoinNonOverlappingTrees (prerelease, for testing only)
+
 ### 5.3.0-prerelease007
 - structured point clouds query (prerelease, for testing only)