diff --git a/[refs] b/[refs]
index 89c602b0c155..9c700b80c11c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: eea79e0713d94b02952f6c591b615710fd40a562
+refs/heads/master: ecb971923614775a118bc05ad16b2bde450cac7d
diff --git a/trunk/include/linux/tcp.h b/trunk/include/linux/tcp.h
index 46a85c9e1f25..3c7ffdb40dc6 100644
--- a/trunk/include/linux/tcp.h
+++ b/trunk/include/linux/tcp.h
@@ -412,7 +412,8 @@ struct tcp_sock {
 
 	struct tcp_sack_block recv_sack_cache[4];
 
-	struct sk_buff *highest_sack;   /* highest skb with SACK received
+	struct sk_buff *highest_sack;   /* skb just after the highest
+					 * skb with SACKed bit set
 					 * (validity guaranteed only if
 					 * sacked_out > 0)
 					 */
diff --git a/trunk/include/net/tcp.h b/trunk/include/net/tcp.h
index 42c29bfbcee3..2d80c291fffb 100644
--- a/trunk/include/net/tcp.h
+++ b/trunk/include/net/tcp.h
@@ -1364,8 +1364,9 @@ static inline void tcp_push_pending_frames(struct sock *sk)
 	}
 }
 
-/* Start sequence of the highest skb with SACKed bit, valid only if
- * sacked > 0 or when the caller has ensured validity by itself.
+/* Start sequence of the skb just after the highest skb with SACKed
+ * bit, valid only if sacked_out > 0 or when the caller has ensured
+ * validity by itself.
  */
 static inline u32 tcp_highest_sack_seq(struct tcp_sock *tp)
 {