diff --git a/e2e/tests/up/up_private_token.go b/e2e/tests/up/up_private_token.go
index ad554de68..1d302c522 100644
--- a/e2e/tests/up/up_private_token.go
+++ b/e2e/tests/up/up_private_token.go
@@ -54,6 +54,7 @@ var _ = ginkgo.Describe(
 			name := "testprivaterepo"
 			ginkgo.DeferCleanup(f.DevsyWorkspaceDelete, name)
 
+			// test repo must have .devcontainer.json to avoid MCR rate limits
 			err = f.DevsyUp(ctx, "https://github.com/"+username+"/test_private_repo.git")
 			framework.ExpectNoError(err)