diff --git a/docs/releases/4.0.txt b/docs/releases/4.0.txt
index c98b47c524..89936640b7 100644
--- a/docs/releases/4.0.txt
+++ b/docs/releases/4.0.txt
@@ -87,7 +87,7 @@ For example::
         last_name = models.CharField(max_length=255)
 
         class Meta:
-            indexes = [
+            constraints = [
                 UniqueConstraint(
                     Lower('first_name'),
                     Lower('last_name').desc(),