client.go | 3 ++-

diff --git a/client.go b/client.go
index c92f7c2c82c9bc732b03bed91e50da6f1c31ce2b..44298663c1d094d65903557756b8512239cf58e0 100644
--- a/client.go
+++ b/client.go
@@ -1816,7 +1816,8 @@ 		}
 	}
 
 	cl.mu.Unlock()
-	// Write the chunk out.
+	// Write the chunk out. Note that the upper bound on chunk writing
+	// concurrency will be the number of connections.
 	err := t.writeChunk(int(msg.Index), int64(msg.Begin), msg.Piece)
 	cl.mu.Lock()