diff --git a/packages/app/src/setupTests.ts b/packages/app/src/setupTests.ts
index e206a945cc..17ff0c096d 100644
--- a/packages/app/src/setupTests.ts
+++ b/packages/app/src/setupTests.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
 // allows you to do things like:
 // expect(element).toHaveTextContent(/react/i)
 // learn more: https://github.com/testing-library/jest-dom