diff --git a/.changes/cleanup-fn-websocket.md b/.changes/cleanup-fn-websocket.md
new file mode 100644
index 00000000..1af81197
--- /dev/null
+++ b/.changes/cleanup-fn-websocket.md
@@ -0,0 +1,5 @@
+---
+websocket-js: minor
+---
+
+`addListener` now returns a cleanup function instead of `void` to remove the listener.
\ No newline at end of file