diff --git a/images/sk-packet.proto b/images/sk-packet.proto
index dcda280f6..e15dd382a 100644
--- a/images/sk-packet.proto
+++ b/images/sk-packet.proto
@@ -8,5 +8,9 @@ message scm_entry {
 message sk_packet_entry {
 	required uint32		id_for		= 1;
 	required uint32		length		= 2;
+	// Reserved for message address
+	// optional bytes		addr	= 3;
 	repeated scm_entry	scm		= 4;
+	// Reserved for ucred restore
+	// optional sk_ucred_entry	ucred	= 128;
 }