diff --git a/django/contrib/auth/base_user.py b/django/contrib/auth/base_user.py
index 31fec4f7237..48ab950c433 100644
--- a/django/contrib/auth/base_user.py
+++ b/django/contrib/auth/base_user.py
@@ -19,7 +19,7 @@ class BaseUserManager(models.Manager):
     @classmethod
     def normalize_email(cls, email):
         """
-        Normalize the email address by lowercasing the domain part of the it.
+        Normalize the email address by lowercasing the domain part of it.
         """
         email = email or ''
         try: