diff --git a/doc/developers/contributing.rst b/doc/developers/contributing.rst
index 0bb8b1fc39f59..0251638a71378 100644
--- a/doc/developers/contributing.rst
+++ b/doc/developers/contributing.rst
@@ -432,7 +432,7 @@ Building the documentation
 
 Building the documentation requires installing some additional packages::
 
-    pip install sphinx sphinx-gallery numpydoc matplotlib Pillow pandas scikit-image
+    pip install sphinx sphinx-gallery numpydoc matplotlib Pillow pandas scikit-image joblib
 
 To build the documentation, you need to be in the ``doc`` folder::