diff --git a/content/u/blog/chat-app-of-2021/contents.lr b/content/u/blog/chat-app-of-2021/contents.lr
index 0946c95..223b099 100644
--- a/content/u/blog/chat-app-of-2021/contents.lr
+++ b/content/u/blog/chat-app-of-2021/contents.lr
@@ -84,8 +84,8 @@ as we liked it to be at that time and our team would miss getting
 messages often while on the run between different data center
 locations.
 
-After spending some time with Rocketchat we moved to self-hosted
-Mattermost looking for a more stable experience. With its robust
+After spending some time with Rocketchat we moved to [self-hosted
+Mattermost](https://ungleich.ch/u/products/zero-carbon-chat/) looking for a more stable experience. With its robust
 performance and friendly UI (that we still think is one of the best
 out there), our team became quite happy with Mattermost.