diff --git a/storage/buffer.go b/storage/buffer.go
index b1b5f8148..6ff7b8a1b 100644
--- a/storage/buffer.go
+++ b/storage/buffer.go
@@ -42,7 +42,6 @@ func NewBuffer(delta int64) *BufferedSeriesIterator {
 // NewBufferIterator returns a new iterator that buffers the values within the
 // time range of the current element and the duration of delta before.
 func NewBufferIterator(it chunkenc.Iterator, delta int64) *BufferedSeriesIterator {
-	// TODO(codesome): based on encoding, allocate different buffer.
 	bit := &BufferedSeriesIterator{
 		buf:   newSampleRing(delta, 0, chunkenc.ValNone),
 		delta: delta,