diff --git a/doc/fluid/new_docs/beginners_guide/index.rst b/doc/fluid/new_docs/beginners_guide/index.rst
index e18933dcc0038129077a455892ddd785579f0003..b15106692b45e8cd476763add88c0b71c8b96871 100644
--- a/doc/fluid/new_docs/beginners_guide/index.rst
+++ b/doc/fluid/new_docs/beginners_guide/index.rst
@@ -9,7 +9,7 @@
 ..  toctree::
     :maxdepth: 2
     
-    install/install_doc.rst
+    install/install_doc.md
     quick_start/index.rst
     basics/index.rst
     basics/learning_materials.md