diff --git a/api/services/images/v1/images.pb.go b/api/services/images/v1/images.pb.go
index 8bbfcc8ba..4577eb089 100644
--- a/api/services/images/v1/images.pb.go
+++ b/api/services/images/v1/images.pb.go
@@ -165,6 +165,8 @@ type DeleteImageRequest struct {
 	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
 	// Sync indicates that the delete and cleanup should be done
 	// synchronously before returning to the caller
+	//
+	// Default is false
 	Sync bool `protobuf:"varint,2,opt,name=sync,proto3" json:"sync,omitempty"`
 }
 
diff --git a/api/services/images/v1/images.proto b/api/services/images/v1/images.proto
index 3d013abfc..152ade2a0 100644
--- a/api/services/images/v1/images.proto
+++ b/api/services/images/v1/images.proto
@@ -118,5 +118,7 @@ message DeleteImageRequest {
 
 	// Sync indicates that the delete and cleanup should be done
 	// synchronously before returning to the caller
+	//
+	// Default is false
 	bool sync = 2;
 }
diff --git a/gc/scheduler/scheduler.go b/gc/scheduler/scheduler.go
index 3a70b2a36..b8c2ca06c 100644
--- a/gc/scheduler/scheduler.go
+++ b/gc/scheduler/scheduler.go
@@ -230,6 +230,7 @@ func (s *gcScheduler) run(ctx context.Context) {
 		interval    = time.Second
 		gcTime      time.Duration
 		collections int
+		// TODO(dmcg): expose collection stats as metrics
 
 		triggered bool
 		deletions int
@@ -270,6 +271,7 @@ func (s *gcScheduler) run(ctx context.Context) {
 					(s.mutationThreshold > 0 && mutations >= s.mutationThreshold))) {
 				// Check if not already scheduled before delay threshold
 				if nextCollection == nil || nextCollection.After(time.Now().Add(s.scheduleDelay)) {
+					// TODO(dmcg): track re-schedules for tuning schedule config
 					schedC, nextCollection = schedule(s.scheduleDelay)
 				}
 			}
diff --git a/services/images/service.go b/services/images/service.go
index ad90d6abe..0f118992e 100644
--- a/services/images/service.go
+++ b/services/images/service.go
@@ -36,7 +36,7 @@ func init() {
 				return nil, err
 			}
 
-			return NewService(m.(*metadata.DB), g.(gcScheduler), ic.Events), nil
+			return NewService(m.(*metadata.DB), ic.Events, g.(gcScheduler)), nil
 		},
 	})
 }
@@ -52,7 +52,7 @@ type service struct {
 }
 
 // NewService returns the GRPC image server
-func NewService(db *metadata.DB, gc gcScheduler, publisher events.Publisher) imagesapi.ImagesServer {
+func NewService(db *metadata.DB, publisher events.Publisher, gc gcScheduler) imagesapi.ImagesServer {
 	return &service{
 		db:        db,
 		gc:        gc,