diff --git a/README.md b/README.md
index bbfe6d97..e3846432 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
+# This branch is for legacy support of the Bookshelf step tutorials.
+# For the up-to-date version of this repository, see the `master` branch.
+
 # Getting started with PHP on Google Cloud Platform
 
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