 | This is an essay on the Verifiability policies. It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints. |
 | This page in a nutshell: Real example of Verifiability, not truth in action. Any material added to Wikipedia must have been published previously by a reliable source. Editors may not add content solely because they know something is true due to outdated reliable sources. |
Per the verifiability, not truth mentality and process on Wikipedia, some things that are known to be factually inaccurate may remain in articles. One way this can occur is when reliable sources become outdated with new primary information. Unless an update for an event is large or significant enough to be covered by a reliable secondary source, outdated information will remain in the article as the new information would not have a secondary reliable source to back it up.