Hover-over feature in QlikView?

[#1]

I'd like to know know if there is one of the following features in QlikView.

I have a dashboard with 4 quadrants of information (for example).  One of those quadrants shows Sales data and one of the fields of the Sales data is Gross Margin.  I would like users to know how Gross Margin is calculated.  So is there a way they can hover their mouse over the Gross Margin field and it displays text: "Gross Margin = (Revenue- Cost)/Revenue"? 

Even if I have to put a small box/button on the dashboard next to the Gross Margin field that users can click and it displays a box that can be closed to show the same text is acceptable.

Thanks

[#2]

The easiest way is to go to Properties > Caption and write that in the Help Text box. This way it will show on hover.

[#3]

Okay, great.  I'll try that.  Thanks!

[#4]

Here are a couple examples.