diff --git a/disba/_ellipticity.py b/disba/_ellipticity.py
index 4792064..5dac7c7 100644
--- a/disba/_ellipticity.py
+++ b/disba/_ellipticity.py
@@ -13,7 +13,9 @@
 ]
 
 
-RayleighEllipticity = namedtuple("RayleighEllipticity", ("period", "ellipticity", "mode"))
+RayleighEllipticity = namedtuple(
+    "RayleighEllipticity", ("period", "ellipticity", "mode")
+)
 
 
 class Ellipticity(Base):