Add mention of develop branch to README.md (#1207)
diff --git a/README.md b/README.md
index 2fd7123..d039a3c 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,12 @@
See [pico-examples](https://github.com/raspberrypi/pico-examples) for example code you can build.
+# Getting the latest SDK code
+
+The [master](https://github.com/raspberrypi/pico-sdk/tree/master/) branch of `pico-sdk` on GitHub contains the
+_latest stable release_ of the SDK. If you need or want to test upcoming features, you can try the
+[develop](https://github.com/raspberrypi/pico-sdk/tree/develop/) branch instead.
+
# Quick-start your own project
These instructions are extremely terse, and Linux-based only. For detailed steps,
