diff --git a/.gitignore b/.gitignore
index 5d381cc..eeae4e0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -159,4 +159,4 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
-
+reference/