diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index d83f95e..1aca744 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -955,6 +955,13 @@ enum {
 	BPF_SOCK_OPS_NEEDS_ECN,		/* If connection's congestion control
 					 * needs ECN
 					 */
+	BPF_SOCK_OPS_BASE_RTT,		/* Get base RTT. The correct value is
+					 * based on the path and may be
+					 * dependent on the congestion control
+					 * algorithm. In general it indicates
+					 * a congestion threshold. RTTs above
+					 * this indicate congestion
+					 */
 };
 
 #define TCP_BPF_IW		1001	/* Set TCP initial congestion window */