diff --git a/UPGRADE-3.1.md b/UPGRADE-3.1.md
new file mode 100644
index 000000000..5b2b2baa9
--- /dev/null
+++ b/UPGRADE-3.1.md
@@ -0,0 +1,9 @@
+UPGRADE FROM 3.0 to 3.1
+=======================
+
+Configuration
+-------------
+
+The `doctrine.orm.entity_managers.some_em.enable_native_lazy_objects`
+configuration option is deprecated and will be removed in DoctrineBundle 4.0,
+as native lazy objects are now always enabled.
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index a18467eb9..b10d3b967 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -410,7 +410,11 @@ private function addOrmSection(ArrayNodeDefinition $node): void
                                 ->ifTrue(static fn ($v) => $v === false)
                                 ->thenInvalid('The setting "enable_native_lazy_objects" can no longer be disabled and should not be set')
                             ->end()
-                            ->info('no-op, will be deprecated and removed in the future')
+                            ->setDeprecated(
+                                'doctrine/doctrine-bundle',
+                                '3.1',
+                                'The "%node%" option is deprecated and will be removed in DoctrineBundle 4.0, as native lazy objects are now always enabled.',
+                            )
                         ->end()
                         ->arrayNode('controller_resolver')
                             ->canBeDisabled()