diff --git a/README.md b/README.md
index ce843a89bb8b9a0de6f64342ec134b5ccc94586b..41a5f0ed058df941ee92199c0e1461098ba702db 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,11 @@ A first idea on how to structure the databases holding the information on
 publications, see [Database-structure.md](./Database-structure.md)
 in this repository.
 
+The codebase of this project is located on the [JSC-Gitlab](<https://gitlab.jsc.fz-juelich.de/fritz1/rse-monitor>).
+Other locations, such as on [codebase.helmholtz.cloud](<https://codebase.helmholtz.cloud/j.fritz/rse-monitor>)
+or [jugit.fz-juelich.de](<https://jugit.fz-juelich.de/rg-rse/rse-monitor>)
+are only mirrors of this.
+
 The RSE-Monitor itself can be found
 [on this website](<https://fritz1.pages.jsc.fz-juelich.de/rse-monitor/>).