diff --git a/README.md b/README.md
index 5ac8849..d96f611 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,8 @@ export SONG_LIBRARY=/path/to/library
 
 **A web-based UI to browse the song library.** It supports searching by title and artist, and allows to mark and unmark favorites on the client side (using local storage).
 
+The UI was developed in a different repository, available for historic reasons at https://gitlab.cl.uni-heidelberg.de/moser/karaokatalog-ui.
+
 #### Serve
 
 **Launch a server for the catalogue UI** on localhost. Mostly useful for development purposes.