This page is where you can specify which words are excluded from Concrete CMS's slug creation (that sounds gross, let's say "URL-friendly-name creation"). So with the default exclusions, if your page was named Stratford-upon-Avon, your generated slug/URL-friendly name would be /stratford-upon-avon. But if your page name was Stratford-on-Avon, your slug/URL-friendly name would be /stratford-avon, as "on" is in the exclusion list. This is designed to maximize the SEO value of your pages, as search engines get more useful information from words that aren't articles and prepositions.
