Thread:Affirmation/@comment-8-20160725191319/@comment-5028213-20160728161343

Well, Wikia has no policy and doesn't follow Wikipedia (policy) on this. Err, if Wikipedia had a policy on naming their help pages…

It is plural because it's a better fit ("Help:Templates" -> oh, it's help on templates). The singular remains as a redirect to help find the help page anyway (also because of Shared Help).

Wikipedia uses singular for their articles because it has that lexical/scientific touch.