diff --git a/src/HelpFile b/src/HelpFile
index c9e015810..9c53ec498 100644
--- a/src/HelpFile
+++ b/src/HelpFile
@@ -82,8 +82,10 @@ pm, print_multigrammar: pm
       (Automatically executes the strip command (s) before doing this.)
   options:
       -utf8  apply UTF8-encoding to the grammar
+      -graph print module dependency graph in 'dot' format
   examples:
       pm | wf Letter.gfcm  -- print the grammar into the file Letter.gfcm
+      pm -printer=graph | wf D.dot  -- then do 'dot -Tps D.dot > D.ps'
 
 po, print_options: po
       Print what modules there are in the state. Also
diff --git a/src/HelpFile.hs b/src/HelpFile.hs
index c2bed6b15..27d8e2551 100644
--- a/src/HelpFile.hs
+++ b/src/HelpFile.hs
@@ -111,8 +111,10 @@ txtHelpFile =
   "\n      (Automatically executes the strip command (s) before doing this.)" ++
   "\n  options:" ++
   "\n      -utf8  apply UTF8-encoding to the grammar" ++
+  "\n      -graph print module dependency graph in 'dot' format" ++
   "\n  examples:" ++
   "\n      pm | wf Letter.gfcm  -- print the grammar into the file Letter.gfcm" ++
+  "\n      pm -printer=graph | wf D.dot  -- then do 'dot -Tps D.dot > D.ps'" ++
   "\n" ++
   "\npo, print_options: po" ++
   "\n      Print what modules there are in the state. Also" ++