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diff --git a/docs/DesignDocument.md b/docs/DesignDocument.md
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@@ -400,6 +400,9 @@ does not show interactions with the `User` model that solely check
authorization to perform an action. It does not show controller
methods calling the error views. It shows transitions from a view to
a controller *only* when that is the *primary* purpose of the view; many
-workflows can be interupted at any time.
+workflows can be interupted at any time. Arrows betwen models and
+controllers indicate which direction data is flowing. Any data
+flowing from a model to the method of a controller is implicitly
+passed to the view that method renders.
![](DesignDocument-classes.pdf)\