Added TODO.
diff --git a/reader.go b/reader.go
index ae3febe..3570f00 100644
--- a/reader.go
+++ b/reader.go
@@ -19,6 +19,8 @@
 	}
 }
 
+// TODO: performance when current (or next?) sequence is received as a parameter to Receive
+// instead of reading the cursor...
 func (this *Reader) Receive() (int64, int64) {
 	next := this.readerCursor.Load() + 1
 	ready := this.upstreamBarrier.Load()