diff --git a/NOTES.md b/NOTES.md
index 77aa888..529df25 100644
--- a/NOTES.md
+++ b/NOTES.md
@@ -3,3 +3,8 @@
 - its a sans-io module, no IO included
 - its got a callback API recv -> onmessage which Id like to replace
   - plan is then maybe to use a async with API for this handling
+
+- refs
+  - https://github.com/mafintosh/simple-message-channels/blob/master/index.js
+  - https://github.com/mafintosh/simple-message-channels/blob/master/test.js
+  - https://github.com/mafintosh/simple-message-channels/blob/master/example.js