diff --git a/codecov.yml b/codecov.yml
index 38422f8218ea..506f3445de42 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -8,3 +8,5 @@ coverage:
 ignore:
   - "**/error*.rs" # ignore all error.rs files
   - "tests/runner/*.rs" # ignore integration test runner
+comment:                  # this is a top-level key
+  layout: "diff"