Making a question easier to find

Just now I thought of a question that I figured must have already been asked before, and indeed it was: here. However, it was a little harder to find than I expected. I would have expected that searching for "Ladner's theorem" or "NP-intermediate" would have turned it up, but neither did (at least not directly), even though those phrases do appear in the comments to the question. Is there a way to make the question easier for future searchers to find? Since it's community wiki, I guess I could just edit the question myself, but I'm not sure if that is appropriate etiquette. Also, since the search engine evidently doesn't work the way I expected, I'm not even sure what kind of edit to make to ensure the result I want.

• The problem/feature is that the search engine does not search comments. I think it is completely OK to improve a CW question, we can also add NP-intermediate tag to the question. (As a side note, I think if questions had separate fields for subject classification and keywords (like papers) then it would help searching a lot, but right now the system has only a tags field which are used for both subject area and keywords and a question can have at most 5 tags.) Jun 25, 2011 at 21:36
• O.K., I created an NP-intermediate tag and also edited the question to mention Ladner's theorem. Now the question shows up when I search for "Ladner's theorem" (in quotation marks), but not when I search for NP-intermediate. Doesn't the search engine search tags? Jun 25, 2011 at 22:37
• It does, but you may need to use brackets [NP-intermediate]. We may also need to wait sometime (24 hours I think) for the tag database to get updated. Jun 25, 2011 at 23:27