diff --git a/projectq/ops/_gates.py b/projectq/ops/_gates.py
index 530fcce76..c5037c865 100755
--- a/projectq/ops/_gates.py
+++ b/projectq/ops/_gates.py
@@ -270,7 +270,7 @@ def __str__(self):
         return "Measure"
 
     def __or__(self, qubits):
-        """
+        """ 
         Previously (ProjectQ <= v0.3.6) MeasureGate/Measure was allowed to be
         applied to any number of quantum registers. Now the MeasureGate/Measure
         is strictly a single qubit gate. In the coming releases the backward