  People want to be able to verify information on Wikipedia. So, significant edits need have their content cited using reliable sources. See verifiablity. This means that information must be published, and presumably vetted, by reliable groups and individuals. What you should do is to locate a source that supports the edit you wish to make. Then add a citation to that. Peruse wp:welcome to learn about editing Wikipedia. You can also visit the Teahouse for information and assistance.   