diff --git a/python/wtte/weibull.py b/python/wtte/weibull.py
index 70ee081..acde675 100644
--- a/python/wtte/weibull.py
+++ b/python/wtte/weibull.py
@@ -5,6 +5,7 @@
 
 def cumulative_hazard(t, a, b):
     """ Cumulative hazard
+    
     :param t: Value
     :param a: Alpha
     :param b: Beta