There are many types of flowcharts yet I have not found one suiting specific needs: showing the flow of MVC application. Google says nothing on this topic. Strange.
The closest thing I have found is this thing
When it comes to specifying model it is simple - just use UML. But for other parts? There is no good set of rules on specifying controllers, pages, forms, partials (or fragments or whatever you call it) and actions.
Something I need to look further into.