Small doc notes
diff --git a/doc/source/intro.rst b/doc/source/intro.rst
index c580182..d3fb16d 100644
--- a/doc/source/intro.rst
+++ b/doc/source/intro.rst
@@ -21,7 +21,7 @@
 ------------------------
 
 **clearly this needs a lot of work, however I believe the structure
-is mostly there...**
+is mostly there... If you know graphviz please help!**
 
 .. graphviz::