diff --git a/scrapy/core/scheduler.py b/scrapy/core/scheduler.py
index 9d0258db2..d87d2ffdc 100644
--- a/scrapy/core/scheduler.py
+++ b/scrapy/core/scheduler.py
@@ -77,13 +77,8 @@ class Scheduler(object):
 
     def open(self, spider):
         self.spider = spider
-
-        # in-memory PriorityQueue instance
         self.mqs = self._mq()
-
-        # on-disk PriorityQueue instance
         self.dqs = self._dq() if self.dqdir else None
-
         return self.df.open()
 
     def close(self, reason):