diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go
index 8e0a88f0a3..f6452ea133 100644
--- a/src/runtime/mgcmark.go
+++ b/src/runtime/mgcmark.go
@@ -335,7 +335,7 @@ func scanframeworker(frame *stkframe, unused unsafe.Pointer, gcw *gcWork) {
 	}
 }
 
-// gcDrain scans objects in work buffers (starting with wbuf), blackening grey
+// gcDrain scans objects in work buffers, blackening grey
 // objects until all work buffers have been drained.
 //go:nowritebarrier
 func gcDrain(gcw *gcWork) {