diff --git a/scrapy/squeues.py b/scrapy/squeues.py
index 0b8f6af7d..d2074a457 100644
--- a/scrapy/squeues.py
+++ b/scrapy/squeues.py
@@ -25,9 +25,9 @@ def _serializable_queue(queue_class, serialize, deserialize):
 def _pickle_serialize(obj):
     try:
         return pickle.dumps(obj, protocol=2)
-    # Python<=3.4 raises pickle.PicklingError here while
-    # Python>=3.5 raises AttributeError and
-    # Python>=3.6 raises TypeError
+    # Python <= 3.4 raises pickle.PicklingError here while
+    # 3.5 <= Python < 3.6 raises AttributeError and
+    # Python >= 3.6 raises TypeError
     except (pickle.PicklingError, AttributeError, TypeError) as e:
         raise ValueError(str(e))