diff --git a/releasenotes/notes/zk-360-01c3d236debde0b6.yaml b/releasenotes/notes/zk-360-01c3d236debde0b6.yaml
new file mode 100644
index 000000000..eda18e7e6
--- /dev/null
+++ b/releasenotes/notes/zk-360-01c3d236debde0b6.yaml
@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Nodepool now requires ZooKeeper version 3.6.0 or later (note that
+    at the time of this writing, the oldest supported ZooKeeper
+    version is later than that).