diff --git a/docs/conf.py b/docs/conf.py
index 7371f8c..647d082 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -53,3 +53,6 @@ html_theme = 'alabaster'
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
+
+# Assign master document so readthedocs is happy
+master_doc = 'index'