diff --git a/docs/conf.py b/docs/conf.py
index 34270de..d3588bd 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -49,6 +49,7 @@
     "numpydoc",
     "myst_nb",
     "dargs.sphinx",
+    "sphinxarg.ext",
 ]
 
 # Add any paths that contain templates here, relative to this directory.