Explain blue dot on "pull" button

[JoeStrout]

I've been using GitUp for a couple weeks, and I can't for the life of me understand why sometimes the "pull" button (near bottom-left of the map view) has a blue dot in it. I've got a blue dot right now, but when I click the button it just tells me 'the branch "main" is already up-to-date with its upstream!' I have no local changes, either. But sometimes the blue dot goes away, so I know it's not a permanent feature of the button.

This blue dot is not explained by the hover tip, nor is it mentioned in the documentation.

Concrete suggestions:

• When you apply (or remove) the blue dot, update the help tag.
• Add an explanation to the "using GitUp map view" page of the docs.