diff --git a/README.md b/README.md
index f8d2a8d..430f10c 100644
--- a/README.md
+++ b/README.md
@@ -5,14 +5,29 @@ 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.**
+## Branches
+
+The `main` branch is where active development happens:
+
+    git clone -b main https://git.syndicate-lang.org/syndicate-lang/syndicate-js
+
+An earlier TypeScript+JavaScript implementation from early 2021 (the
+primary difference to `main` being a lack of object-capability
+support) can be found on the `typescript1` branch:
 
     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.
+Finally, the `babel-based` branch is from 2018, and is an
+implementation for JavaScript only. It extends babel with new syntax
+and new plugins, (rather than implementing its own error-tolerant
+parser, like `typescript1` and `main`):
+
+    git clone -b babel-based https://git.syndicate-lang.org/syndicate-lang/syndicate-js
 
 ## Building
 
+*These instructions are for the `main` branch.*
+
 This project uses [`yarn`](https://yarnpkg.com/), not `npm`.
 
 The repository is a monorepo, using