diff --git a/docs/module-package-catalog.example.json b/docs/module-package-catalog.example.json
index 38d8142..2b54c12 100644
--- a/docs/module-package-catalog.example.json
+++ b/docs/module-package-catalog.example.json
@@ -87,6 +87,14 @@
           "version": "0.2.0"
         }
       ],
+      "requires_interfaces": [
+        {
+          "name": "campaigns.access",
+          "version_min": "0.1.0",
+          "version_max_exclusive": "0.2.0",
+          "optional": true
+        }
+      ],
       "artifact_integrity": {
         "python": {
           "ref": "govoplan-mail @ git+ssh://git@git.add-ideas.de/add-ideas/govoplan-mail.git@v0.1.4",
diff --git a/tests/test_module_system.py b/tests/test_module_system.py
index ef3e0a6..c1cff6a 100644
--- a/tests/test_module_system.py
+++ b/tests/test_module_system.py
@@ -3131,6 +3131,12 @@ finally:
         }, modules["files"]["requires_interfaces"])
         self.assertEqual(["campaigns"], modules["files"]["optional_dependencies"])
         self.assertIn({"name": "mail.campaign_delivery", "version": "0.2.0"}, modules["mail"]["provides_interfaces"])
+        self.assertIn({
+            "name": "campaigns.access",
+            "optional": True,
+            "version_min": "0.1.0",
+            "version_max_exclusive": "0.2.0",
+        }, modules["mail"]["requires_interfaces"])
         self.assertIn({
             "name": "files.campaign_attachments",
             "optional": True,