diff --git a/sys/netinet/tcp.h b/sys/netinet/tcp.h
index 084448567b7e..12b6d57eab81 100644
--- a/sys/netinet/tcp.h
+++ b/sys/netinet/tcp.h
@@ -101,7 +101,7 @@ struct tcphdr {
 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)
 #define	TCPOPT_SACK_HDR		(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8)
 /* Miscellaneous constants */
-#define	MAX_SACK_BLKS	6	/* Max # SACK blocks stored at sender side */
+#define	MAX_SACK_BLKS	6	/* Max # SACK blocks stored at receiver side */
 #define	TCP_MAX_SACK	4	/* MAX # SACKs sent in any segment */