diff --git a/esmf_regrid/constants.py b/esmf_regrid/constants.py
index 29a6d31f..8b50cfa9 100644
--- a/esmf_regrid/constants.py
+++ b/esmf_regrid/constants.py
@@ -7,8 +7,10 @@
 
 class Constants:
     """Encompassing class for best practice import."""
+
     class Method(Enum):
         """holds enums for Method values."""
+
         CONSERVATIVE = esmpy.RegridMethod.CONSERVE
         BILINEAR = esmpy.RegridMethod.BILINEAR
         NEAREST = esmpy.RegridMethod.NEAREST_STOD