diff --git a/doc/source/index.rst b/doc/source/index.rst
index 9362516769..b010c6cf14 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -16,7 +16,7 @@ with a unified interface to a heterogeneous fleet of servers while also
 providing the Compute service with an interface that allows physical servers to
 be managed as though they were virtual machines.
 
-`An introduction to ironic's conceptual architecture <deploy/user-guide>`_
+`An introduction to ironic's conceptual architecture <deploy/user-guide.html>`_
 is available for those new to the project.
 
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