diff --git a/index.md b/index.md
index 24672f5564882eeff154e0ec9b79c28b5959d6e9..d3bff10ae116c1b91c493d0ec889250995949d61 100644
--- a/index.md
+++ b/index.md
@@ -8,7 +8,9 @@ If you are looking for a guided tour, watch [https://media.tuhh.de/e10/gabel/res
 
 The webpage is currently delivered to [https://fabiangabel.gitlab.io/research-topics-mat-tuhh](https://fabiangabel.gitlab.io/research-topics-mat-tuhh).
 
-If you want to contribute a research topic, see the [CONTRIBUTING.md](https://gitlab.com/fabiangabel/research-topics-mat-tuhh/-/blob/master/CONTRIBUTING.md).
+The corresponding GitLab repository is hosted at [https://collaborating.tuhh.de/cfg0846/research-topics-mat-tuhh](https://collaborating.tuhh.de/cfg0846/research-topics-mat-tuhh) and push-mirrored to [https://gitlab.com/fabiangabel/research-topics-mat-tuhh](https://gitlab.com/fabiangabel/research-topics-mat-tuhh)
+
+If you want to contribute a research topic, see the [CONTRIBUTING.md](https://collaborating.tuhh.de/cfg0846/research-topics-mat-tuhh/-/blob/master/CONTRIBUTING.md).
 
 In order to display the potential of this page, we are all part of the [template research topic](https://fabiangabel.gitlab.io/research-topics-mat-tuhh/topic-template.html).