diff --git a/README.md b/README.md
index 7a047be..fc0c462 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
-# webpub-viewer
+# Deprecated
+
+As of July 2023, this app is no longer in use at NYPL, and the current implementation is https://github.com/NYPL-Simplified/web-reader. Please contact the eReading team in Digital for more information. For NYPL developers, please see additional documentation on [Confluence](https://confluence.nypl.org/display/DIGTL/Webreader).
+
+## webpub-viewer
 
 A viewer application for web publications, based on Hadrien Gardeur's proof of concept https://github.com/HadrienGardeur/webpub-viewer.