diff --git a/momoko/connection.py b/momoko/connection.py
index c8246e4..68e0672 100644
--- a/momoko/connection.py
+++ b/momoko/connection.py
@@ -312,7 +312,7 @@ def on_reanimate_done(fut):
 
     def putconn(self, connection):
         """
-        Retrun busy connection back to the pool.
+        Return busy connection back to the pool.
 
         **NOTE:** This is a synchronous method.
 
@@ -320,7 +320,6 @@ def putconn(self, connection):
             Connection object previously returned by :py:meth:`momoko.Pool.getconn`.
         """
 
-        assert connection in self.conns.busy
         self.conns.release(connection)
 
         if self.conns.all_dead: