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-rw-r--r--Doc/library/base64.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/library/base64.rst b/Doc/library/base64.rst
index c9ce28b..2a9840b 100644
--- a/Doc/library/base64.rst
+++ b/Doc/library/base64.rst
@@ -16,7 +16,8 @@ email, used as parts of URLs, or included as part of an HTTP POST request. The
encoding algorithm is not the same as the :program:`uuencode` program.
There are two interfaces provided by this module. The modern interface supports
-encoding and decoding string objects using all three alphabets. The legacy
+encoding and decoding string objects using all three :rfc:`3548` defined
+alphabets (normal, URL-safe, and filesystem-safe). The legacy
interface provides for encoding and decoding to and from file-like objects as
well as strings, but only using the Base64 standard alphabet.