diff --git a/src/cmd/trace/trace.go b/src/cmd/trace/trace.go
index 7d38ab0799..d87a5bac38 100644
--- a/src/cmd/trace/trace.go
+++ b/src/cmd/trace/trace.go
@@ -362,7 +362,7 @@ func generateTrace(params *traceParams) ViewerData {
 			if ctx.gtrace {
 				continue
 			}
-			ctx.emitSlice(ev, "MARK")
+			ctx.emitSlice(ev, "MARK TERMINATION")
 		case trace.EvGCScanDone:
 		case trace.EvGCSweepStart:
 			ctx.emitSlice(ev, "SWEEP")
diff --git a/src/internal/trace/parser.go b/src/internal/trace/parser.go
index 527aba7ab4..fa62eccf72 100644
--- a/src/internal/trace/parser.go
+++ b/src/internal/trace/parser.go
@@ -858,8 +858,8 @@ const (
 	EvProcStop       = 6  // stop of P [timestamp]
 	EvGCStart        = 7  // GC start [timestamp, seq, stack id]
 	EvGCDone         = 8  // GC done [timestamp]
-	EvGCScanStart    = 9  // GC scan start [timestamp]
-	EvGCScanDone     = 10 // GC scan done [timestamp]
+	EvGCScanStart    = 9  // GC mark termination start [timestamp]
+	EvGCScanDone     = 10 // GC mark termination done [timestamp]
 	EvGCSweepStart   = 11 // GC sweep start [timestamp, stack id]
 	EvGCSweepDone    = 12 // GC sweep done [timestamp]
 	EvGoCreate       = 13 // goroutine creation [timestamp, new goroutine id, new stack id, stack id]
diff --git a/src/runtime/trace.go b/src/runtime/trace.go
index 707e4c617b..b64debcac4 100644
--- a/src/runtime/trace.go
+++ b/src/runtime/trace.go
@@ -28,8 +28,8 @@ const (
 	traceEvProcStop       = 6  // stop of P [timestamp]
 	traceEvGCStart        = 7  // GC start [timestamp, seq, stack id]
 	traceEvGCDone         = 8  // GC done [timestamp]
-	traceEvGCScanStart    = 9  // GC scan start [timestamp]
-	traceEvGCScanDone     = 10 // GC scan done [timestamp]
+	traceEvGCScanStart    = 9  // GC mark termination start [timestamp]
+	traceEvGCScanDone     = 10 // GC mark termination done [timestamp]
 	traceEvGCSweepStart   = 11 // GC sweep start [timestamp, stack id]
 	traceEvGCSweepDone    = 12 // GC sweep done [timestamp]
 	traceEvGoCreate       = 13 // goroutine creation [timestamp, new goroutine id, new stack id, stack id]