diff --git a/NOTES.md b/NOTES.md
index 529df25..c87d240 100644
--- a/NOTES.md
+++ b/NOTES.md
@@ -8,3 +8,4 @@
   - 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
+  - https://github.com/mafintosh/simple-message-channels#api