diff --git a/common/bit_array.go b/common/bit_array.go
index d478d02ec..320b629ef 100644
--- a/common/bit_array.go
+++ b/common/bit_array.go
@@ -156,6 +156,7 @@ func (bA *BitArray) Sub(o *BitArray) *BitArray {
 		i := len(o.Elems) - 1
 		if i >= 0 {
 			for idx := i * 64; idx < o.Bits; idx++ {
+				// NOTE: each individual GetIndex() call to o is safe.
 				c.setIndex(idx, c.getIndex(idx) && !o.GetIndex(idx))
 			}
 		}
diff --git a/p2p/connection.go b/p2p/connection.go
index 9984d835e..aa4b4394c 100644
--- a/p2p/connection.go
+++ b/p2p/connection.go
@@ -419,7 +419,7 @@ FOR_LOOP:
 			}
 			msgBytes := channel.recvMsgPacket(pkt)
 			if msgBytes != nil {
-				//log.Debug("Received bytes", "chId", pkt.ChannelId, "msgBytes", msgBytes)
+				log.Debug("Received bytes", "chId", pkt.ChannelId, "msgBytes", msgBytes)
 				c.onReceive(pkt.ChannelId, msgBytes)
 			}
 		default:
@@ -605,7 +605,7 @@ type msgPacket struct {
 }
 
 func (p msgPacket) String() string {
-	return fmt.Sprintf("MsgPacket{%X:%X}", p.ChannelId, p.Bytes)
+	return fmt.Sprintf("MsgPacket{%X:%X T:%X}", p.ChannelId, p.Bytes, p.EOF)
 }
 
 //-----------------------------------------------------------------------------