diff --git a/docs/conf.py b/docs/conf.py
index 54591c1..45fb6f2 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -53,4 +53,9 @@
 # Add any paths that contain custom static files (such as style sheets) here,
 # 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']
\ No newline at end of file
+html_static_path = ['_static']
+
+# Need to specify the line below if custom conf.py
+# https://github.com/readthedocs/readthedocs.org/issues/2569
+# https://stackoverflow.com/questions/56336234/build-fail-sphinx-error-contents-rst-not-found
+master_doc = 'index'