diff --git a/test_programs/execution_success/poseidon_bn254_hash_width_3/Nargo.toml b/test_programs/execution_success/poseidon_bn254_hash_width_3/Nargo.toml
index 3bf473269f5..7047f0aeef2 100644
--- a/test_programs/execution_success/poseidon_bn254_hash_width_3/Nargo.toml
+++ b/test_programs/execution_success/poseidon_bn254_hash_width_3/Nargo.toml
@@ -3,6 +3,7 @@ name = "poseidon_bn254_hash_width_3"
 type = "bin"
 authors = [""]
 compiler_version = ">=0.31.0"
+# Test usage of `expression_width` field
 expression_width = "3"
 
 [dependencies]
\ No newline at end of file