diff --git a/collects/macro-debugger/util/mpi.rkt b/collects/macro-debugger/util/mpi.rkt
index 6f627aaf63..c4f832c553 100644
--- a/collects/macro-debugger/util/mpi.rkt
+++ b/collects/macro-debugger/util/mpi.rkt
@@ -1,9 +1,12 @@
 #lang scheme/base
-(require scheme/match)
+(require scheme/match
+         scheme/string)
 
 (provide mpi->list
-         mpi->string)
+         mpi->string
+         self-mpi?)
 
+;; mpi->list : module-path-index -> list
 (define (mpi->list mpi)
   (cond [(module-path-index? mpi)
          (let-values ([(path relto) (module-path-index-split mpi)])
@@ -18,12 +21,16 @@
   (if (module-path-index? mpi)
       (let ([mps (mpi->list mpi)])
         (cond [(pair? mps)
-               (apply string-append
-                      (format "~s" (car mps))
-                      (map (lambda (x) (format " <= ~s" x)) (cdr mps)))]
+               (string-join (map (lambda (x) (format "~s" x)) mps)
+                            " <= ")]
               [(null? mps) "this module"]))
       (format "~s" mpi)))
 
+;; self-mpi? : module-path-index -> bool
+(define (self-mpi? mpi)
+  (let-values ([(path relto) (module-path-index-split mpi)])
+    (eq? path #f)))
+
 ;; --
 
 (provide mpi->mpi-sexpr
diff --git a/collects/macro-debugger/view/hiding-panel.rkt b/collects/macro-debugger/view/hiding-panel.rkt
index 6522fcd23b..0b1d692216 100644
--- a/collects/macro-debugger/view/hiding-panel.rkt
+++ b/collects/macro-debugger/view/hiding-panel.rkt
@@ -16,6 +16,15 @@
 (define mode:standard "Standard")
 (define mode:custom "Custom ...")
 
+#|
+
+TODO
+
+ - allow entry of more policies
+ - visual feedback on rules applying to selected identifier
+   (need to switch from list to editor)
+
+|#
 
 ;; macro-hiding-prefs-widget%
 (define macro-hiding-prefs-widget%
@@ -255,11 +264,13 @@
   (match condition
     [`(free=? ,id)
      (let ([b (identifier-binding id)])
-       (or #;(identifier->string id)
+       (or #| (identifier->string id) |#
            (cond [(list? b)
                   (let ([mod (caddr b)]
                         [name (cadddr b)])
-                    (format "'~s' from ~a" name (mpi->string mod)))]
+                    (if (self-mpi? mod)
+                        (format "'~a' defined in this module" name)
+                        (format "'~s' imported from ~a" name (mpi->string mod))))]
                  [else
                   (symbol->string (syntax-e id))])))]
     [_