diff --git a/clang/test/Tooling/auto-detect-from-source-parent.cpp b/clang/test/Tooling/auto-detect-from-source-parent.cpp
index 25b8b26..f1dbc0f 100644
--- a/clang/test/Tooling/auto-detect-from-source-parent.cpp
+++ b/clang/test/Tooling/auto-detect-from-source-parent.cpp
@@ -8,4 +8,5 @@
 invalid;
 
 // REQUIRES: shell
+// PR15590
 // XFAIL: win64