Wikipedia:Verifiability

This page documents an English Wikipedia policy. It describes a widely accepted standard that all editors should normally follow. Changes made to it should reflect consensus.

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This page in a nutshell: People must be able to check that any of the information within Wikipedia articles is not just made up. This means all material must be attributable to reliable, published sources. Additionally, quotations and any material challenged or likely to be challenged must be supported by inline citations.

In the English Wikipedia, verifiability means that people are able to check that information comes from a reliable source. Its content is determined by previously published information rather than editors' beliefs, experiences, or previously unpublished ideas or information. Even if you are sure something is true, it must have been previously published in a reliable source before you can add it.^[a] If reliable sources disagree with each other, then maintain a neutral point of view and present what the various sources say, giving each side its due weight.

All material in Wikipedia mainspace, including everything in articles, lists, and captions, must be verifiable. Additionally, four types of information must be accompanied by an inline citation to a reliable source that directly supports^[b] the material:

• direct quotations,
• material whose verifiability has been challenged,
• material whose verifiability is likely to be challenged, and
• contentious material about living and recently deceased persons.

Any material that needs an inline citation but does not have one may be removed. Please immediately remove contentious material about living people (or existing groups) that is unsourced or poorly sourced.

For how to write citations, see citing sources. Verifiability, no original research, and neutral point of view are Wikipedia's core content policies. They work together to determine content, so editors should understand the key points of all three. Articles must also comply with the copyright policy.

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