Is there an accepted way of indicating user action vs computed action on a flowchart?

We've found that using flowcharts to help communicate between technical and non-technical teams to be incredibly helpful. The different shapes have different meanings and these are generally accepted and well documented (e.g. a diamond shape indicates a "decision"). However, one thing we haven't been sure or consistent on is how to indicate what is a user action and what is a computed action.

For example, in the same flowchart some decisions will be computed decisions, like "is the user logged in?" and some decisions will be user-input decisions, such as "was this article helpful?".

So is there a generally accepted way of differentiating these types of actions? If not, what do you do?