diff --git a/storage/sealer/sched_assigner_common.go b/storage/sealer/sched_assigner_common.go
index 3aad91cc3..bf92dbf15 100644
--- a/storage/sealer/sched_assigner_common.go
+++ b/storage/sealer/sched_assigner_common.go
@@ -67,6 +67,7 @@ func (a *AssignerCommon) TrySched(sh *Scheduler) {
 
 	partDone := metrics.Timer(sh.mctx, metrics.SchedAssignerCandidatesDuration)
 	defer func() {
+		// call latest value of partDone in case we error out somewhere
 		partDone()
 	}()
 
diff --git a/storage/sealer/sched_test.go b/storage/sealer/sched_test.go
index 812c906e4..2eed1ce73 100644
--- a/storage/sealer/sched_test.go
+++ b/storage/sealer/sched_test.go
@@ -589,12 +589,16 @@ func TestSched(t *testing.T) {
 type slowishSelector bool
 
 func (s slowishSelector) Ok(ctx context.Context, task sealtasks.TaskType, spt abi.RegisteredSealProof, a SchedWorker) (bool, bool, error) {
+	// note: we don't care about output here, just the time those calls take
+	// (selector Ok/Cmp is called in the scheduler)
 	_, _ = a.Paths(ctx)
 	_, _ = a.TaskTypes(ctx)
 	return bool(s), false, nil
 }
 
 func (s slowishSelector) Cmp(ctx context.Context, task sealtasks.TaskType, a, b SchedWorker) (bool, error) {
+	// note: we don't care about output here, just the time those calls take
+	// (selector Ok/Cmp is called in the scheduler)
 	_, _ = a.Paths(ctx)
 	return true, nil
 }