diff --git a/README.md b/README.md
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--- a/README.md
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@@ -1,4 +1,6 @@
-# transitfeed
+> ⚠️ **NOTE:**  This project is no longer actively maintained.  For up-to-date GTFS validation tools, see the https://github.com/MobilityData/gtfs-validator project. ⚠️
+
+## transitfeed
 
 Provides a library to help you parse, validate, and generate [General Transit Feed Spec (GTFS)](https://developers.google.com/transit/gtfs/) feed files.  See INSTALL for installation instructions.