diff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst
index e80850e..3bf371a 100644
--- a/Documentation/dev-tools/kselftest.rst
+++ b/Documentation/dev-tools/kselftest.rst
@@ -151,6 +151,11 @@
    TEST_FILES, TEST_GEN_FILES mean it is the file which is used by
    test.
 
+ * First use the headers inside the kernel source and/or git repo, and then the
+   system headers.  Headers for the kernel release as opposed to headers
+   installed by the distro on the system should be the primary focus to be able
+   to find regressions.
+
 Test Harness
 ============