diff --git a/ARM64_TIDYUPS.txt b/ARM64_TIDYUPS.txt
index 3586c11..c785cb8 100644
--- a/ARM64_TIDYUPS.txt
+++ b/ARM64_TIDYUPS.txt
@@ -176,3 +176,8 @@
 
 valgrind.h: fix VALGRIND_ALIGN_STACK/VALGRIND_RESTORE_STACK,
 also add CFI annotations
+
+
+
+could possibly bring r29 into use, which be useful as it is
+callee saved