diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5fb72da..e74c294 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -175,6 +175,9 @@
 
 	/* This indicates the skb is from an untrusted source. */
 	SKB_GSO_DODGY = 1 << 2,
+
+	/* This indicates the tcp segment has CWR set. */
+	SKB_GSO_TCPV4_ECN = 1 << 3,
 };
 
 /**