diff --git a/distribution/xfer/download.go b/distribution/xfer/download.go
index eb457830ff..83b41ecb4d 100644
--- a/distribution/xfer/download.go
+++ b/distribution/xfer/download.go
@@ -30,7 +30,7 @@ type LayerDownloadManager struct {
 
 // SetConcurrency sets the max concurrent downloads for each pull
 func (ldm *LayerDownloadManager) SetConcurrency(concurrency int) {
-	ldm.tm.SetConcurrency(concurrency)
+	ldm.tm.setConcurrency(concurrency)
 }
 
 // NewLayerDownloadManager returns a new LayerDownloadManager.
@@ -152,7 +152,7 @@ func (ldm *LayerDownloadManager) Download(ctx context.Context, initialRootFS ima
 		if existingDownload, ok := downloadsByKey[key]; ok {
 			xferFunc := ldm.makeDownloadFuncFromDownload(descriptor, existingDownload, topDownload)
 			defer topDownload.Transfer.Release(watcher)
-			topDownloadUncasted, watcher = ldm.tm.Transfer(transferKey, xferFunc, progressOutput)
+			topDownloadUncasted, watcher = ldm.tm.transfer(transferKey, xferFunc, progressOutput)
 			topDownload = topDownloadUncasted.(*downloadTransfer)
 			continue
 		}
@@ -167,7 +167,7 @@ func (ldm *LayerDownloadManager) Download(ctx context.Context, initialRootFS ima
 		} else {
 			xferFunc = ldm.makeDownloadFunc(descriptor, rootFS.ChainID(), nil)
 		}
-		topDownloadUncasted, watcher = ldm.tm.Transfer(transferKey, xferFunc, progressOutput)
+		topDownloadUncasted, watcher = ldm.tm.transfer(transferKey, xferFunc, progressOutput)
 		topDownload = topDownloadUncasted.(*downloadTransfer)
 		downloadsByKey[key] = topDownload
 	}
diff --git a/distribution/xfer/transfer.go b/distribution/xfer/transfer.go
index 8f06f22e89..91c5ce2b6a 100644
--- a/distribution/xfer/transfer.go
+++ b/distribution/xfer/transfer.go
@@ -291,17 +291,17 @@ func newTransferManager(concurrencyLimit int) *transferManager {
 	}
 }
 
-// SetConcurrency sets the concurrencyLimit
-func (tm *transferManager) SetConcurrency(concurrency int) {
+// setConcurrency sets the concurrencyLimit
+func (tm *transferManager) setConcurrency(concurrency int) {
 	tm.mu.Lock()
 	tm.concurrencyLimit = concurrency
 	tm.mu.Unlock()
 }
 
-// Transfer checks if a transfer matching the given key is in progress. If not,
+// transfer checks if a Transfer matching the given key is in progress. If not,
 // it starts one by calling xferFunc. The caller supplies a channel which
 // receives progress output from the transfer.
-func (tm *transferManager) Transfer(key string, xferFunc DoFunc, progressOutput progress.Output) (Transfer, *Watcher) {
+func (tm *transferManager) transfer(key string, xferFunc DoFunc, progressOutput progress.Output) (Transfer, *Watcher) {
 	tm.mu.Lock()
 	defer tm.mu.Unlock()
 
diff --git a/distribution/xfer/transfer_test.go b/distribution/xfer/transfer_test.go
index f63de0d78e..6364ae0aa5 100644
--- a/distribution/xfer/transfer_test.go
+++ b/distribution/xfer/transfer_test.go
@@ -50,7 +50,7 @@ func TestTransfer(t *testing.T) {
 	xfers := make([]Transfer, len(ids))
 	watchers := make([]*Watcher, len(ids))
 	for i, id := range ids {
-		xfers[i], watchers[i] = tm.Transfer(id, makeXferFunc(id), progress.ChanOutput(progressChan))
+		xfers[i], watchers[i] = tm.transfer(id, makeXferFunc(id), progress.ChanOutput(progressChan))
 	}
 
 	for i, xfer := range xfers {
@@ -108,7 +108,7 @@ func TestConcurrencyLimit(t *testing.T) {
 	xfers := make([]Transfer, len(ids))
 	watchers := make([]*Watcher, len(ids))
 	for i, id := range ids {
-		xfers[i], watchers[i] = tm.Transfer(id, makeXferFunc(id), progress.ChanOutput(progressChan))
+		xfers[i], watchers[i] = tm.transfer(id, makeXferFunc(id), progress.ChanOutput(progressChan))
 	}
 
 	for i, xfer := range xfers {
@@ -169,7 +169,7 @@ func TestInactiveJobs(t *testing.T) {
 	xfers := make([]Transfer, len(ids))
 	watchers := make([]*Watcher, len(ids))
 	for i, id := range ids {
-		xfers[i], watchers[i] = tm.Transfer(id, makeXferFunc(id), progress.ChanOutput(progressChan))
+		xfers[i], watchers[i] = tm.transfer(id, makeXferFunc(id), progress.ChanOutput(progressChan))
 	}
 
 	close(testDone)
@@ -237,7 +237,7 @@ func TestWatchRelease(t *testing.T) {
 	watchers[0].progressChan = make(chan progress.Progress)
 	watchers[0].progressDone = make(chan struct{})
 	watchers[0].receivedFirstProgress = make(chan struct{})
-	xfer, watchers[0].watcher = tm.Transfer("id1", makeXferFunc("id1"), progress.ChanOutput(watchers[0].progressChan))
+	xfer, watchers[0].watcher = tm.transfer("id1", makeXferFunc("id1"), progress.ChanOutput(watchers[0].progressChan))
 	go progressConsumer(watchers[0])
 
 	// Give it multiple watchers
@@ -295,7 +295,7 @@ func TestWatchFinishedTransfer(t *testing.T) {
 	// Start a transfer
 	watchers := make([]*Watcher, 3)
 	var xfer Transfer
-	xfer, watchers[0] = tm.Transfer("id1", makeXferFunc("id1"), progress.ChanOutput(make(chan progress.Progress)))
+	xfer, watchers[0] = tm.transfer("id1", makeXferFunc("id1"), progress.ChanOutput(make(chan progress.Progress)))
 
 	// Give it a watcher immediately
 	watchers[1] = xfer.Watch(progress.ChanOutput(make(chan progress.Progress)))
@@ -371,7 +371,7 @@ func TestDuplicateTransfer(t *testing.T) {
 		t.progressChan = make(chan progress.Progress)
 		t.progressDone = make(chan struct{})
 		t.receivedFirstProgress = make(chan struct{})
-		t.xfer, t.watcher = tm.Transfer("id1", makeXferFunc("id1"), progress.ChanOutput(t.progressChan))
+		t.xfer, t.watcher = tm.transfer("id1", makeXferFunc("id1"), progress.ChanOutput(t.progressChan))
 		go progressConsumer(*t)
 	}
 
diff --git a/distribution/xfer/upload.go b/distribution/xfer/upload.go
index 98b6799e15..a369daff5c 100644
--- a/distribution/xfer/upload.go
+++ b/distribution/xfer/upload.go
@@ -22,7 +22,7 @@ type LayerUploadManager struct {
 
 // SetConcurrency sets the max concurrent uploads for each push
 func (lum *LayerUploadManager) SetConcurrency(concurrency int) {
-	lum.tm.SetConcurrency(concurrency)
+	lum.tm.setConcurrency(concurrency)
 }
 
 // NewLayerUploadManager returns a new LayerUploadManager.
@@ -79,7 +79,7 @@ func (lum *LayerUploadManager) Upload(ctx context.Context, layers []UploadDescri
 		}
 
 		xferFunc := lum.makeUploadFunc(descriptor)
-		upload, watcher := lum.tm.Transfer(descriptor.Key(), xferFunc, progressOutput)
+		upload, watcher := lum.tm.transfer(descriptor.Key(), xferFunc, progressOutput)
 		defer upload.Release(watcher)
 		uploads = append(uploads, upload.(*uploadTransfer))
 		dedupDescriptors[key] = upload.(*uploadTransfer)