Lowercase the short word in the title

Warning²Federal courts, Illinois courts21st and 22nd editions

The title of a United Nations masthead document is capitalized the way any title is, so an article, conjunction or preposition of four letters or fewer stays lowercase inside it.¹

1. 1R. 21.7.4(b) Title. Tables: R. 8(a) Headings and titles.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.