diff --git a/include/llvm/MC/MCRegisterInfo.h b/include/llvm/MC/MCRegisterInfo.h
index c41d4666063..47833b02fdf 100644
--- a/include/llvm/MC/MCRegisterInfo.h
+++ b/include/llvm/MC/MCRegisterInfo.h
@@ -510,7 +510,7 @@ public:
 // super-registers. All registers aliasing Unit can be visited like this:
 //
 //   for (MCRegUnitRootIterator RI(Unit, MCRI); RI.isValid(); ++RI) {
-//     for (MCSuperRegIterator SI(Root, MCRI, true); SI.isValid(); ++SI)
+//     for (MCSuperRegIterator SI(*RI, MCRI, true); SI.isValid(); ++SI)
 //       visit(*SI);
 //    }