There's another, much more convenient possibility: using MB's built-in bookmark feature, combined with modifying the Comment tag of the concerned file.
- To define a bookmark in MB, you must mark a start and an end (so use Ctrl+D twice), whereas other players define a bookmark as one time mark.
- So as to make 'Bookmarks' visible in the Navigator Panel (and thus be able to pin it as a tab), activate it in the Preferences:
Preferences -> Layout (1) -> left sidebar -> [v] bookmarks - In the Bookmarks tab, add Comment to the displayed tags, so that you can edit its value.
EDIT:
The solution proposed by Vincent works, but it's tricky.
There's no commenting feature in cue sheets, thus the only way is to define a supplemental track with your comment as title.
It also means that you have to renumber all the tracks of your album if you want to keep its original order.
EDIT 2:
The Comment tag shown in the Bookmarks tab is specific for each bookmark defined, and differs from the Comment tag saved in the audio file.