diff --git a/doc/source/conf.py b/doc/source/conf.py
index a8be22b901e1bc2a477d457b1ba53b1ef80cb5d7..2703ba5e8a3ca2b93210e35946fe87da527c0478 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -25,7 +25,14 @@ sys.path.insert(0, os.path.abspath('../../'))
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['sphinx.ext.autodoc', 'sphinx.ext.intersphinx', 'sphinx.ext.todo', 'sphinx.ext.coverage', 'sphinx.ext.viewcode']
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.intersphinx',
+    'sphinx.ext.todo',
+    'sphinx.ext.coverage',
+    'sphinx.ext.viewcode',
+    'sphinxcontrib.httpdomain'
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']