diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index 6f45fd3878..c1f9b6a53b 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -26,6 +26,7 @@ Shell commands
    conitrace
    echo
    exception
+   extension
    exit
    false
    fatinfo