Teeny fonts in Word’s revisions balloons?

Every now and again I find documents where the revisions balloons are unreadable because the font is wrong. This can be fixed. Press Ctrl-Alt-Shift-S to open the Style window Click Manage Styles at the bottom

Select Alphabetical order

Find Balloon Text style in the alphabetical list

Click Modify

Choose a Font size (and any other font characteristics you want) and click OK

Now the balloon text should be readable.