How to show colorbar endpoints?

[Hunter Hicks]

Hello, I am new to using pyqtgraph and am impressed with what I've seen. I have a quick question though. My plot has a colorbar with levels set from -60 to 20. I would like the ticks on the colorbar to display those maximum and minimum levels. Currently, I cannot figure out how to get these endpoints to display. It's a very minor thing but I'd like to see those endpoints in the colorbar. Below is what currently displays.

Thank you!