diff --git a/llvm/utils/update_llc_test_checks.py b/llvm/utils/update_llc_test_checks.py
--- a/llvm/utils/update_llc_test_checks.py
+++ b/llvm/utils/update_llc_test_checks.py
@@ -5,6 +5,10 @@
 This script is a utility to update LLVM 'llc' based test cases with new
 FileCheck patterns. It can either update all of the tests in the file or
 a single test function.
+
+If your function has link attributes it will not match the regex this script
+uses when deciding which functions to update the test cases for. Often the link
+attributes are unnecessary, therefore you should delete them.
 """
 
 from __future__ import print_function