1 files changed, 1 insertions, 1 deletions
diff --git a/setup.py b/setup.py
index e7b1df4..ac670a5 100644
--- a/setup.py
+++ b/setup.py
@@ -52,6 +52,6 @@ setup(
         "gmp": ["gmpy2"],
         "dev": ["mypy", "flake8", "interrogate", "pyinstrument", "black", "types-setuptools"],
         "test": ["nose2", "parameterized", "coverage"],
-        "doc": ["sphinx", "sphinx-autodoc-typehints", "nbsphinx", "sphinx-paramlinks"]
+        "doc": ["sphinx", "sphinx-autodoc-typehints", "nbsphinx", "sphinx-paramlinks", "sphinx_design"]
     }
 )