diff --git a/README.md b/README.md
index 88d00cab..6e28f2f0 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+**WARNING: this is stale, unmaintained repository. Up-to-date upstream
+project is at https://github.com/pfalcon/micropython-lib**
+
+
 micropython-lib
 ===============
 micropython-lib is a project to develop a non-monolothic standard library