diff -r ca5635efe090 Doc/library/base64.rst
--- a/Doc/library/base64.rst	Sun Mar 02 09:19:03 2014 +0100
+++ b/Doc/library/base64.rst	Mon Mar 03 11:21:07 2014 +0900
@@ -18,7 +18,8 @@
 
 There are two interfaces provided by this module.  The modern interface
 supports encoding and decoding ASCII byte string objects using all three
-alphabets. Additionally, the decoding functions of the modern interface also
+alphabets (normal, URL and Filesystem safe alphabet).
+Additionally, the decoding functions of the modern interface also
 accept Unicode strings containing only ASCII characters. The legacy interface
 provides for encoding and decoding to and from file-like objects as well as
 byte strings, but only using the Base64 standard alphabet.