`  :Please read the policy at Wikipedia:Verifiability - ``The threshold for inclusion in Wikipedia is verifiability, not truth—meaning, in this context, whether readers are able to check that material added to Wikipedia has already been published by a reliable source, not whether we think it is true. Editors should provide a reliable source for quotations and for any material that is challenged or is likely to be challenged, or the material may be removed.``  :All material added needs to be referenced. Verifying something for yourself by testing it is called  Original Research and is not acceptable in Wikipedia articles.   :I have added a ref in this case. In the future, when you add material to articles, please include your reference. -   `