diff --git a/ptulsconv/commands.py b/ptulsconv/commands.py
index b590f8c..8c1e3a3 100644
--- a/ptulsconv/commands.py
+++ b/ptulsconv/commands.py
@@ -37,6 +37,9 @@ class MyEncoder(JSONEncoder):
     force_denominator: Optional[int]
 
     def default(self, o):
+        """
+        
+        """
         if isinstance(o, Fraction):
             return dict(numerator=o.numerator, denominator=o.denominator)
         else: