I have notice that there is a separate tag reference-managers with the following tag-excerpt: "Questions related to various reference/citation management software used for recording and utilising bibliographic citations."
However, it seems that some questions about citations managers are tagged by (citations) and (software) instead of (or in addition to) the tag (reference-managers).
What is the correct way to tag questions of this type? Should we use all three tags? Or perhaps reference-managers and citations (if reference-manages would be considered as "a subtag" of citations)?
Should we add the tag reference-managers to older questions about this topic which do not use this tag in order to make them easier to find? (Perhaps they were asked before the tag was created - or maybe simply the OP was unaware of the tag.)