Clarify core module directories for UPSTREAM => undef modules

diff --git a/pod/perlhack.pod b/pod/perlhack.pod
index 503a4e2..844b83b 100644 (file)
--- a/pod/perlhack.pod
+++ b/pod/perlhack.pod
@@ -384,6 +384,10 @@ core:
     dist/ is for dual-life modules, where the blead source is
           canonical.
 
+For some dual-life modules it has not been discussed if the CPAN version or the
+blead source is canonical. Until that is done, those modules should be in
+F<cpan/>.
+
 =item Tests
 
 There are tests for nearly all the modules, built-ins and major bits