diff --git a/README.md b/README.md
index 55f3be8..b403686 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ A browser-compatible JSON-RPC client with multiple transports:
 - EventEmitter
 - HTTP/HTTPS
 - WebSocket
+- PostmessageWindow
+- PostMessageIframe
 
 
 ```javascript