Rollover comments from linked spreadsheet?

Our student gradebooks are made up of a large number of individual gradesheets. Each individual graded item on each gradesheet is linked to a master spreadsheet that supplies the items to all gradesheets. So, by changing an item on the master spreadsheet, it is reflected in all student gradebooks.

Now I would like to add rollover comments to the individual graded items. Is there any way to link the content of each comment to the same spreadsheet as the one supplying the name of each cell? In other words, can the source text for a rollover comment come from another spreadsheet?

Thanks!