I've seen one of these Scottish birth entries myself, with a note in the margin, and the important bit is that it says "See Reg of Cor. Entr. Vol 1 p 10". This refers to the Register of Corrected Entries, which is the method by which entries of birth are amended in Scotland.
You should be able to see the Register entry from Scotland's People. If you login, and then click on "Viewed Images" (one of the options along the very top of the screen) you should be able to find and view the birth entry which you've attached to your post. Just above the image, you should see a blue button "View Page Before", a green button "View Page After", and there should be an additional brown button which says "View RCE". It'll cost you credits to view it, but that should hold the detail you're looking for. In a few cases the "View RCE" button is missing, in which case, e-mail Scotland's People and they'll most likely send you an image of the entry.