diff --git a/openmc/mgxs/library.py b/openmc/mgxs/library.py
index 0bf9732549..4a17b95e41 100644
--- a/openmc/mgxs/library.py
+++ b/openmc/mgxs/library.py
@@ -382,9 +382,7 @@ class Library(object):
         ----------
         domain : Material or Cell or Universe or Integral
             The material, cell, or universe object of interest (or its ID)
-        mgxs_type : {'total', 'transport', 'absorption', 'capture', 'fission',
-                     'nu-fission', 'scatter', 'nu-scatter', 'scatter matrix',
-                     'nu-scatter matrix', 'chi'}
+        mgxs_type : {'total', 'transport', 'absorption', 'capture', 'fission', 'nu-fission', 'scatter', 'nu-scatter', 'scatter matrix', 'nu-scatter matrix', 'chi'}
             The type of multi-group cross section object to return
 
         Returns