diff --git a/docs/conf.py b/docs/conf.py
index <HASH>..<HASH> 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -100,6 +100,7 @@ html_theme = 'nature-mod'
 
 # Add any paths that contain custom themes here, relative to this directory.
 #html_theme_path = []
+sys.path.append(os.path.abspath('_themes'))
 html_theme_path = ['_themes']
 
 # The name for this set of Sphinx documents.  If None, it defaults to
Add _themes to path.