Allow argument descriptions that begin with an uppercase letter

Even if a particular prose style is encouraged, shouldn't there be a release valve available? (Or is there already?) Forcing all argument descriptions to start lowercase seems overly prescriptive to me, even for a library that describes itself as "opinionated". :)

For example, I'm not sure how to add multiple-sentence descriptions to arguments? Is the preferred way to just make everything lowercase, including the first character of the second sentence?