diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go
index e02c874f66..54f988a902 100644
--- a/src/runtime/mgcmark.go
+++ b/src/runtime/mgcmark.go
@@ -46,8 +46,6 @@ const (
 // gcMarkRootPrepare queues root scanning jobs (stacks, globals, and
 // some miscellany) and initializes scanning-related state.
 //
-// The caller must have call gcCopySpans().
-//
 // The world must be stopped.
 //
 //go:nowritebarrier