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-rw-r--r--docs/topics/auth/customizing.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/docs/topics/auth/customizing.txt b/docs/topics/auth/customizing.txt
index e61780ed79..9c36bf26e5 100644
--- a/docs/topics/auth/customizing.txt
+++ b/docs/topics/auth/customizing.txt
@@ -486,7 +486,10 @@ password resets. You must then provide some key implementation details:
A string describing the name of the field on the User model that is
used as the unique identifier. This will usually be a username of
some kind, but it can also be an email address, or any other unique
- identifier. In the following example, the field `identifier` is used
+ identifier. The field *must* be unique (i.e., have ``unique=True``
+ set in it's definition).
+
+ In the following example, the field `identifier` is used
as the identifying field::
class MyUser(AbstractBaseUser):