From
Wikipedia:Introduction - Wikipedia, the free encyclopedia
"Don't be afraid to edit – anyone can edit almost every page, and we are encouraged to be bold! Find something that can be improved and make it better—for example, spelling, grammar, rewriting for readability, adding content, or removing non-constructive edits. If you wish to add new facts, please try to provide references so they may be verified, or suggest them on the article's discussion page. Changes to controversial topics and Wikipedia's main pages should usually be discussed first."