diff --git a/Lib/smtplib.py b/Lib/smtplib.py
index b71fee8777e866..808f0fd47e8b4e 100644
--- a/Lib/smtplib.py
+++ b/Lib/smtplib.py
@@ -734,6 +734,7 @@ def login(self, user, password, *, initial_response_ok=True):
             preferred_auths = ['CRAM-MD5', 'PLAIN', 'LOGIN']
         else:
             preferred_auths = ['PLAIN', 'LOGIN']
+        # We try the supported authentications in our preferred order, if
         # the server supports them.
         authlist = [auth for auth in preferred_auths
                     if auth in advertised_authlist]