diff --git a/src/wagtail_localize_smartling/apps.py b/src/wagtail_localize_smartling/apps.py
index 10d7ccf..145e8e0 100644
--- a/src/wagtail_localize_smartling/apps.py
+++ b/src/wagtail_localize_smartling/apps.py
@@ -6,3 +6,6 @@ class WagtailLocalizeSmartlingAppConfig(AppConfig):
     label = "wagtail_localize_smartling"
     name = "wagtail_localize_smartling"
     verbose_name = "Wagtail Localize Smartling"
+
+    def ready(self):
+        from . import checks, signals  # noqa: F401
diff --git a/src/wagtail_localize_smartling/checks.py b/src/wagtail_localize_smartling/checks.py
index 26b9d42..ab88cf4 100644
--- a/src/wagtail_localize_smartling/checks.py
+++ b/src/wagtail_localize_smartling/checks.py
@@ -1 +1,19 @@
-# TODO check required settings
+from django.core.checks import Error, register
+from django.core.exceptions import ImproperlyConfigured
+
+from .settings import settings as smartling_settings
+
+
+@register()
+def smartling_settings_check(app_configs, **kwargs):
+    errors = []
+    try:
+        str(smartling_settings.PROJECT_ID)
+    except ImproperlyConfigured as e:
+        errors.append(
+            Error(
+                e.args[0],
+                id="wagtail_localize_smartling.E001",
+            )
+        )
+    return errors