diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go
index cdcca5797c..261788c9d8 100644
--- a/src/runtime/mgcmark.go
+++ b/src/runtime/mgcmark.go
@@ -202,7 +202,7 @@ func markrootSpans(gcw *gcWork, shard int) {
 // allowAssist is true, may assist GC scanning in proportion to the
 // allocations performed by this mutator since the last assist.
 //
-// It should only be called if gcAssistAlloc != 0.
+// It should only be called if gcBlackenEnabled != 0.
 //
 // This must be called with preemption disabled.
 //go:nowritebarrier