diff --git a/README.md b/README.md
index 32a8446..67b9204 100644
--- a/README.md
+++ b/README.md
@@ -154,7 +154,8 @@
 at some point and therefore no longer supported.
 
 `extended/`: Contains test cases for boot testing, code update testing using
-legacy REST, etc.
+legacy REST, etc. The "extended" subdirectory uses legacy REST and will be
+deprecated at some point and therefore no longer supported.
 
 `systest/`: Contains test cases for HTX bootme testing.