Document what needs to happen when you add a new test directory

diff --git a/pod/perlhack.pod b/pod/perlhack.pod
index b4cfc4f..4c83a12 100644 (file)
--- a/pod/perlhack.pod
+++ b/pod/perlhack.pod
@@ -1756,6 +1756,9 @@ so there are some snags (and it would be wonderful for you to brush
 them out), but it basically works that way.  Everything else lives in
 F<t/>.
 
+If you add a new test directory under F<t/>, it is imperative that you 
+add that directory to F<t/HARNESS> and F<t/TEST>.
+
 =over 3
 
 =item F<t/base/>