Adjusted comment to actual semantics.
It might be nice to add an easy way to write a hook that is only run if all the individual fields pass validation.
@@ -265,7 +265,8 @@ Pass a callable that has the arguments `form`, `field`, and `parsed_data`. Retur
How do I validate multiple fields together?
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-Refine the `post_validation` hook on the `form`. It is run after all the individual fields have passed validation. In there you can call `form.add_error`.
+Refine the `post_validation` hook on the `form`. It is run after all the individual fields validation
+has run. But note that it is run even if the individual fields validation was not successful.
How do I exclude a field?
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