diff --git a/Lib/decimal.py b/Lib/decimal.py
index af29e68..aac90d7 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -17,7 +17,7 @@
 This is an implementation of decimal floating point arithmetic based on
 the General Decimal Arithmetic Specification:
 
-    www2.hursley.ibm.com/decimal/decarith.html
+    http://speleotrove.com/decimal/decarith.html
 
 and IEEE standard 854-1987:
 
@@ -130,6 +130,8 @@
     'setcontext', 'getcontext', 'localcontext'
 ]
 
+__version__ = '1.70'    # Highest version of the spec this complies with
+
 import copy as _copy
 import math as _math
 import numbers as _numbers