diff --git a/tests/testthat/helper.R b/tests/testthat/helper.R
index 84edb4a..3ead8e5 100644
--- a/tests/testthat/helper.R
+++ b/tests/testthat/helper.R
@@ -1 +1,2 @@
+# Defined under tests/ (not R/) to avoid a cyclic dependency
 toy_profile_emissions_impl_output <- tiltIndicatorAfter::toy_profile_emissions_impl_output