diff --git a/docs/conf.py b/docs/conf.py
index 9e317b7..706b795 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -42,7 +42,7 @@ class Mock(MagicMock):
     def __getattr__(cls, name):
             return Mock()
 
-MOCK_MODULES = ['numpy']
+MOCK_MODULES = ['numpy', 'xlrd']
 sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)