diff --git a/packages/-ember-data/tests/unit/custom-class-support/custom-class-model-test.ts b/packages/-ember-data/tests/unit/custom-class-support/custom-class-model-test.ts
index 213379f16b0..2d44fa4e4ac 100644
--- a/packages/-ember-data/tests/unit/custom-class-support/custom-class-model-test.ts
+++ b/packages/-ember-data/tests/unit/custom-class-support/custom-class-model-test.ts
@@ -110,8 +110,8 @@ module('unit/model - Custom Class Model', function (hooks) {
     store.push({ data: { id: '1', type: 'person', attributes: { name: 'chris' } } });
     recordData.storeWrapper.notifyChange(identifier, 'relationships', 'key');
     recordData.storeWrapper.notifyChange(identifier, 'relationships', 'key');
-    recordData.storeWrapper.notifyChange(identifier, 'state', 'key');
-    recordData.storeWrapper.notifyChange(identifier, 'errors', 'key');
+    recordData.storeWrapper.notifyChange(identifier, 'state');
+    recordData.storeWrapper.notifyChange(identifier, 'errors');
     await settled();
 
     assert.strictEqual(notificationCount, 3, 'called notification callback');
diff --git a/packages/store/addon/-private/managers/record-notification-manager.ts b/packages/store/addon/-private/managers/record-notification-manager.ts
index 75c8fb9d970..fffc1c84b15 100644
--- a/packages/store/addon/-private/managers/record-notification-manager.ts
+++ b/packages/store/addon/-private/managers/record-notification-manager.ts
@@ -57,7 +57,7 @@ export default class NotificationManager {
   // notify(identifier: StableRecordIdentifier, value: 'errors' | 'meta' | 'identity' | 'state'): boolean;
   notify(identifier: StableRecordIdentifier, value: NotificationType, key?: string): boolean {
     assert(
-      `Notify does not accept a key argument for the namespace ${value}. Received ${key}.`,
+      `Notify does not accept a key argument for the namespace '${value}'. Received key '${key}'.`,
       !key || value === 'attributes' || value === 'relationships'
     );
     if (!isStableIdentifier(identifier)) {