diff --git a/cmd/experimental/migrate/internal/migrate.go b/cmd/experimental/migrate/internal/migrate.go
index dae149df..bca1ffe6 100644
--- a/cmd/experimental/migrate/internal/migrate.go
+++ b/cmd/experimental/migrate/internal/migrate.go
@@ -96,10 +96,10 @@ func Migrate(ctx context.Context, numWorkers int, sourceSize uint64, sourceRoot
 	// init
 	targetSize, targetRoot, err := m.storage.State(ctx)
 	if err != nil {
-		return fmt.Errorf("Size: %v", err)
+		return fmt.Errorf("size: %v", err)
 	}
 	if targetSize > sourceSize {
-		return fmt.Errorf("Target size %d > source size %d", targetSize, sourceSize)
+		return fmt.Errorf("target size %d > source size %d", targetSize, sourceSize)
 	}
 	if targetSize == sourceSize {
 		if !bytes.Equal(targetRoot, sourceRoot) {
@@ -137,7 +137,7 @@ func Migrate(ctx context.Context, numWorkers int, sourceSize uint64, sourceRoot
 	eg.Go(func() error {
 		r, err := m.storage.AwaitIntegration(ctx, sourceSize)
 		if err != nil {
-			return fmt.Errorf("Migration failed: %v", err)
+			return fmt.Errorf("migration failed: %v", err)
 		}
 		if !bytes.Equal(root, sourceRoot) {
 			return fmt.Errorf("migration completed, but local root hash %x != source root hash %x", targetRoot, sourceRoot)
@@ -147,7 +147,7 @@ func Migrate(ctx context.Context, numWorkers int, sourceSize uint64, sourceRoot
 	})
 
 	if err := eg.Wait(); err != nil {
-		return fmt.Errorf("Migration failed: %v", err)
+		return fmt.Errorf("migration failed: %v", err)
 	}
 
 	klog.Infof("Migration successful.")