diff --git a/docs/extended/index.md b/docs/extended/index.md
index 0854c4f1..fab2fa63 100644
--- a/docs/extended/index.md
+++ b/docs/extended/index.md
@@ -4,4 +4,5 @@ This document links to all extended configuration documentations for a better ov
 
 - [landscape.iaas](iaas.md)
 - [landscape.dashboard](dashboard.md)
-- [landscape.gardener](gardener.md)
\ No newline at end of file
+- [landscape.gardener](gardener.md)
+- [landscape.cert-manager](cert-manager.md)