CLHS: Section 1.5.1.3

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## 1.5.1.3 Documentation of Extensions

A conforming implementation shall be accompanied by a document that separately describes any features accepted by the implementation that are not specified in this standard, but that do not cause any ambiguity or contradiction when added to the language standard. Such extensions shall be described as being ``extensions to Common Lisp as specified by ANSI <<standard number>>.''

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