diff --git a/README.md b/README.md
index 4a99a2f..f8d2a8d 100644
--- a/README.md
+++ b/README.md
@@ -5,10 +5,12 @@ TypeScript and JavaScript, in both node.js and the browser. The
 implementation techniques herein are the subject of a forthcoming
 paper.
 
-**IMPORTANT: Use branch `typescript1` when cloning this project from git:**
+**IMPORTANT: Use branch `typescript1` when cloning this project from git.**
 
     git clone -b typescript1 https://git.syndicate-lang.org/syndicate-lang/syndicate-js
 
+The `main` branch is under active development, and is quite a different system.
+
 ## Building
 
 This project uses [`yarn`](https://yarnpkg.com/), not `npm`.