diff --git a/package_linter.py b/package_linter.py
index d2b7810..7daed73 100755
--- a/package_linter.py
+++ b/package_linter.py
@@ -1974,6 +1974,17 @@ class Manifest(TestSuite):
                         "When using a postgresql database, you should add postgresql in apt dependencies."
                     )
 
+        main_perm = self.manifest["resources"].get('permissions', {}).get('main', {})
+        if (
+            isinstance(main_perm.get('url'), str)
+            and "init_main_permission" not in self.manifest['install']
+            and not main_perm.get('allowed')
+        ):
+            yield Warning(
+                "You should add a 'init_main_permission' question, or define `allowed` for main permission to have the app ready to be accessed right after installation."
+            )
+
+
         @test()
         def manifest_schema(self):