PACKAGING: add patchlevel.h doc entry

diff --git a/PACKAGING b/PACKAGING
index 0c69b87..9b27d07 100644 (file)
--- a/PACKAGING
+++ b/PACKAGING
@@ -27,4 +27,13 @@ the codebase for this string.
 An alternative strategy would be to skip all porting tests, but many of
 them are useful if additional patches might be applied.
 
+=head1 Customizing patchlevel to advertise your local patches
+
+You can advertise your custom local patches by using patchlevel.h as a
+standalone Perl script.
+
+=head2 Sample usage:
+
+               perl -x patchlevel.h "This is a custom patch"
+
 =cut