diff --git a/README.md b/README.md
index 113fc6dea..609b81b14 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 This repo contains all the code for the computer version of Anki.
 
+:warning: The master branch is currently in alpha. Please see
+https://betas.ankiweb.net/#/
+
 If you'd like to try development builds of Anki but don't feel comfortable
 building the code, please see
 https://anki.tenderapp.com/discussions/beta-testing