diff --git a/test/Interop/Cxx/operators/member-inline-irgen.swift b/test/Interop/Cxx/operators/member-inline-irgen.swift
index 3d5f445d07864..797682073a393 100644
--- a/test/Interop/Cxx/operators/member-inline-irgen.swift
+++ b/test/Interop/Cxx/operators/member-inline-irgen.swift
@@ -1,6 +1,6 @@
 // RUN: %target-swift-emit-ir %s -I %S/Inputs -enable-cxx-interop | %FileCheck %s
 //
-// We can't yet call member functions correctly on Windows.
+// We can't yet call member functions correctly on Windows (SR-13129).
 // XFAIL: OS=windows-msvc
 
 import MemberInline
diff --git a/test/Interop/Cxx/operators/member-inline.swift b/test/Interop/Cxx/operators/member-inline.swift
index d18ddbcfbac69..0313d849da70b 100644
--- a/test/Interop/Cxx/operators/member-inline.swift
+++ b/test/Interop/Cxx/operators/member-inline.swift
@@ -2,7 +2,7 @@
 //
 // REQUIRES: executable_test
 //
-// We can't yet call member functions correctly on Windows.
+// We can't yet call member functions correctly on Windows (SR-13129).
 // XFAIL: OS=windows-msvc
 
 import MemberInline