diff -r 470954641f3b Lib/_collections_abc.py
--- a/Lib/_collections_abc.py	Sun Jun 05 12:07:48 2016 +0000
+++ b/Lib/_collections_abc.py	Sun Jun 05 11:45:02 2016 -0700
@@ -818,8 +818,7 @@
 
     """All the operations on a read-only sequence.
 
-    Concrete subclasses must override __new__ or __init__,
-    __getitem__, and __len__.
+    Concrete subclasses must override __getitem__ and __len__.
     """
 
     __slots__ = ()
@@ -896,8 +895,8 @@
 
     """All the operations on a read-write sequence.
 
-    Concrete subclasses must provide __new__ or __init__,
-    __getitem__, __setitem__, __delitem__, __len__, and insert().
+    Concrete subclasses must provide __getitem__, __setitem__, __delitem__,
+    __len__, and insert().
 
     """