Adding a Missing Issue

(these are the instructions from the old OI)

Adding Issues to an Existing Series

To add issues to a series, search for the series and drill down into it. There are two links, "add issue" and "add multiple". The easier method is to add multiple at once. This just takes a start number and and end number and fills in all the issues in between. This obviously won't fill in funky numbers (alpha, infinity, 1000000, 1.5, etc.). For that you need the add single issue link. The thing with that is that you have to make sure you enter the correct cover sort code. this will be done differently

A general rule is not to work ahead more than three months or so for a monthly series. Exceptions are mini-series, which are often set up in one go, as the final issue is already announced (although of course not certain, as the series may be expanded or cancelled prematurely).