diff --git a/lib/playwright/api/errors/web_error.ex b/lib/playwright/api/errors/web_error.ex
new file mode 100644
index 00000000..e69de29b
diff --git a/lib/playwright/websocket.ex b/lib/playwright/websocket.ex
index 1a243b67..838323ad 100644
--- a/lib/playwright/websocket.ex
+++ b/lib/playwright/websocket.ex
@@ -13,6 +13,11 @@ defmodule Playwright.WebSocket do
   # def expect_event(web_socket, event, predicate \\ nil, options \\ %{})
   # ...delegate wait_for_event -> expect_event
 
+  # on(...):
+  #   - close
+  #   - framereceived
+  #   - framesent
+  #   - socketerror
   # @spec on(t(), binary(), function()) :: nil
   # def on(web_socket, event, callback)