diff --git a/src/v3/compiler/tests/integration/test_runner_test.rs b/src/v3/compiler/tests/integration/test_runner_test.rs
index 995a8c06305..4d0541f78e7 100644
--- a/src/v3/compiler/tests/integration/test_runner_test.rs
+++ b/src/v3/compiler/tests/integration/test_runner_test.rs
@@ -877,8 +877,14 @@ data suite: TestSuite = {
 }
 
 #[test]
-fn r1_canonical_complexity_lens_bytes_include_cost_of() {
+fn r1_canonical_complexity_lens_bytes_declare_complexity_of() {
     let bytes = v3_compiler::test_runner::R1_CANONICAL_COMPLEXITY_LENS;
+    // Post-PR #2271 widening: `cost_of` (int-depth adapter) renamed/widened
+    // to `complexity_of` returning `Lookup<ComplexitySummary>` per
+    // `docs/v3-lens-capability-register.md` complexity.dag row promotion.
+    // The legacy `cost_of` Rust adapter still exists per the register row,
+    // but the canonical lens-bytes (`.dag` source) now declare
+    // `complexity_of` directly.
     assert!(
         bytes.contains("fn complexity_of"),
         "canonical lens should declare complexity_of"