diff --git a/README.md b/README.md
index e3c82db..ed41d30 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # loyalty-api
 
 Deprecated. Kept running because two hundred people still have cards.
+
+**Do not build anything new against this.** It goes away when the last card
+expires.