diff --git a/wire/protocol.go b/wire/protocol.go
index 26797c70..30fdb01e 100644
--- a/wire/protocol.go
+++ b/wire/protocol.go
@@ -66,6 +66,10 @@ const (
 	// SFNodeBloom is a flag used to indicate a peer supports bloom
 	// filtering.
 	SFNodeBloom
+
+	// SFNodeWitness is a flag used to indicate a peer supports blocks
+	// and transactions including witness data (BIP0144).
+	SFNodeWitness
 )
 
 // Map of service flags back to their constant names for pretty printing.
@@ -73,6 +77,7 @@ var sfStrings = map[ServiceFlag]string{
 	SFNodeNetwork: "SFNodeNetwork",
 	SFNodeGetUTXO: "SFNodeGetUTXO",
 	SFNodeBloom:   "SFNodeBloom",
+	SFNodeWitness: "SFNodeWitness",
 }
 
 // orderedSFStrings is an ordered list of service flags from highest to
@@ -81,6 +86,7 @@ var orderedSFStrings = []ServiceFlag{
 	SFNodeNetwork,
 	SFNodeGetUTXO,
 	SFNodeBloom,
+	SFNodeWitness,
 }
 
 // String returns the ServiceFlag in human-readable form.
diff --git a/wire/protocol_test.go b/wire/protocol_test.go
index accc0495..db9991f4 100644
--- a/wire/protocol_test.go
+++ b/wire/protocol_test.go
@@ -16,7 +16,8 @@ func TestServiceFlagStringer(t *testing.T) {
 		{SFNodeNetwork, "SFNodeNetwork"},
 		{SFNodeGetUTXO, "SFNodeGetUTXO"},
 		{SFNodeBloom, "SFNodeBloom"},
-		{0xffffffff, "SFNodeNetwork|SFNodeGetUTXO|SFNodeBloom|0xfffffff8"},
+		{SFNodeWitness, "SFNodeWitness"},
+		{0xffffffff, "SFNodeNetwork|SFNodeGetUTXO|SFNodeBloom|SFNodeWitness|0xfffffff0"},
 	}
 
 	t.Logf("Running %d tests", len(tests))