Question: This is more a suggestion than a question, though answers and comments are welcome.

In question [What should the tag wikis contain?](https://cstheory.meta.stackexchange.com/questions/341/what-should-the-tag-wikis-contain), Robin suggests the preferred content for tag wikis. Unfortunately, most tags I checked did not have any wiki.

I added several tag wikis, and felt like suggesting this to other colleagues as well. I believe at least the top-20 tags must have wikis.

Answer: 
We can use some help for setting-up tag-wikis:

> 
> **We need your help to make the page 1 and page 2 tags great** — so please pitch in and contribute a tag wiki excerpt or edit a tag wiki excerpt to make it better. To invite editing, there’s a small edit link that will dynamically appear as you mouse over the tags page if you have enough reputation.
> 
> 
> Here’s a few words of advice on writing tag wiki excerpts:
> 
> 
> 1. **The excerpt is the elevator pitch for the tag.** You only have ~500 plain text characters for the excerpt, so don’t feel obligated to cover everything in it! Save that for the 30,000+ character Markdown tag wiki. The excerpt should define the shared quality of questions containing this tag — boiled down to a few short sentences.
> 2. **Avoid generically defining the concept behind a tag, unless it is highly specialized.** The “email” tag, for example, does not need to explain what email is. I think we can safely assume most internet users know what email is; there’s no value in a boilerplate explanation of email to anyone.
> 3. **Concentrate on what a tag means to your community.** For “email” on Server Fault, mention the server aspects of email including POP3, SMTP, IMAP, and server software. For “email” on Super User, mention desktop email clients and explicitly exclude webmail, as that would be more appropriate for webapps.stackexchange.com.
> 4. **Provide basic guidance on when to use the tag.** In other words, what kinds of questions should have this tag? Tags only exist as ways of organizing questions, so if we don’t provide proper guidance on which questions need this tag, they won’t get tagged at all, rendering the tag excerpt moot. Think of it as a sales pitch: in a room full of tags screaming “pick me!”, what would convince a question asker to select your tag?
> 
> 
> 

<http://blog.stackoverflow.com/2011/03/redesigned-tags-page/>
There is nothing wrong with writing tag wikis if someone wants to. That said, I do not find it “unfortunate” that many tags lack wiki.

For some tags, it is very desirable to have some explanation. For example, the meaning of the tag [qma](https://cstheory.stackexchange.com/questions/tagged/qma "show questions tagged 'qma'") is unclear to those who are not familiar with the complexity class QMA, but renaming it to something like “quantum-merlin-arthur” makes the meaning of the tag less clear to those who are familiar with the concept, so using the tag wiki (actually its one-line summary which is shown on the question list page) is very appropriate. Another example is [csp](https://cstheory.stackexchange.com/questions/tagged/csp "show questions tagged 'csp'"); renaming it to “constraint-satisfaction-problem” might have been better, but the system does not support this long tag.

Some tags have closely related tags which may be more appropriate for particular questions (such as [approximation-algorithms](https://cstheory.stackexchange.com/questions/tagged/approximation-algorithms "show questions tagged 'approximation-algorithms'"), to which [approximation-hardness](https://cstheory.stackexchange.com/questions/tagged/approximation-hardness "show questions tagged 'approximation-hardness'") is a possible alternative). Other tags deserve some explanation of usage (such as [big-list](https://cstheory.stackexchange.com/questions/tagged/big-list "show questions tagged 'big-list'") and [open-problem](https://cstheory.stackexchange.com/questions/tagged/open-problem "show questions tagged 'open-problem'")). I do not think that tag wiki is a very effective place to write this kind of explanation, but we do not have many choices anyway, so I think that writing tag wiki is one of the best options available.

Other than these cases, it seems to me that tag wiki is completely optional. As I said, there is nothing wrong with writing tag wikis if someone wants to, but I do not think that tag wiki is very much needed.