diff --git a/release-notes/opensearch-knn.release-notes-1.3.9.0.md b/release-notes/opensearch-knn.release-notes-1.3.9.0.md
new file mode 100644
index 000000000..1b46180b0
--- /dev/null
+++ b/release-notes/opensearch-knn.release-notes-1.3.9.0.md
@@ -0,0 +1,12 @@
+## Version 1.3.9.0 Release Notes
+
+Compatible with OpenSearch 1.3.9
+
+### Enhancements
+
+* Change initial size of DocIdSetBuilder ([#502](https://github.com/opensearch-project/k-NN/pull/502))
+
+
+### Infrastructure
+
+* Increment version to 1.3.9 ([#749](https://github.com/opensearch-project/k-NN/pull/749))