diff --git a/Lib/base64.py b/Lib/base64.py
index 4a0e9d446edb0bc..01e49eb0915ef29 100644
--- a/Lib/base64.py
+++ b/Lib/base64.py
@@ -1,4 +1,4 @@
-"""Base16, Base32, Base64 (RFC 3548), Base85 and Ascii85 data encodings"""
+"""Base16, Base32, Base64 (RFC 4648), Base85 and Ascii85 data encodings"""
 
 # Modified 04-Oct-1995 by Jack Jansen to use binascii module
 # Modified 30-Dec-2003 by Barry Warsaw to add full RFC 3548 support