diff --git a/src/runtime/mheap.go b/src/runtime/mheap.go
index 0bbda4aa3b..0069328346 100644
--- a/src/runtime/mheap.go
+++ b/src/runtime/mheap.go
@@ -399,7 +399,7 @@ type mspan struct {
 	_    sys.NotInHeap
 	next *mspan     // next span in list, or nil if none
 	prev *mspan     // previous span in list, or nil if none
-	list *mSpanList // For debugging. TODO: Remove.
+	list *mSpanList // For debugging.
 
 	startAddr uintptr // address of first byte of span aka s.base()
 	npages    uintptr // number of pages in span