diff --git a/src/heapq.py b/src/heapq.py
index 7629327..9f571d2 100644
--- a/src/heapq.py
+++ b/src/heapq.py
@@ -14,7 +14,7 @@ class Heap(list):
     heapify = heapq.heapify
 
     def pushpop(self, item):
-        "Push the item onto the heap and then pop the smallest value"
+        """Push the item onto the heap and then pop the smallest value"""
         if self and self[0] < item:
             return heapq.heapreplace(self, item)
         return item