Add a paragraph to the contributing.md about using AI within this repository.

CONTRIBUTING.md

@@ -16,6 +16,7 @@ The following is a set of guidelines to [`Manifolds.jl`](https://juliamanifolds.
     * [Provide a new manifold](#provide-a-new-manifold)
   * [Code style](#Code-style)
   * [Spell checking](#Spell-checking)
+  * [On the use of AI](#On-the-use-of-AI)
 
 ## How to ask a question
 
@@ -91,7 +92,7 @@ Please follow the [documentation guidelines](https://docs.julialang.org/en/v1/ma
 Please consider a few internal conventions:
 
 
-* Please include a description of the manifold and a reference to the general theory in the `struct` of your manifold that inherits from `AbstractManifold`'.
+* Please include a description of the manifold and a reference to the general theory in the `struct` of your manifold that inherits from `AbstractManifold`.
 * Include the mathematical formulae for any implemented function if a closed form exists.
 * Within the source code of one manifold, the `struct` the manifold should be the first element of the file.
 * an alphabetical order of functions in every file is preferable.
@@ -106,4 +107,16 @@ Please consider a few internal conventions:
 
 ## Spell checking
 
-We use [crate-ci/typos](https://github.com/crate-ci/typos) for spell checking, which is run automatically on GitHub Actions, but you can also run it locally using their command line tool.
+We use [crate-ci/typos](https://github.com/crate-ci/typos) for spell checking, which is run automatically on GitHub Actions, but you can also run it locally using their command line tool.
+
+## On the use of AI
+
+Following the [Julia Discourse Guidelines – Keep it tidy](https://discourse.julialang.org/faq#keep-tidy),
+please do not open PRs or issues that are pure AI generated. `Manifolds.jl` is in its aspects,
+especially the code, the documentation, as well as the tests, carefully curated to be concise,
+well-documented, comprehensive, but in tests also in a (hopefully) good balance between
+ensuring functionality and “over testing”.
+
+Of course it is ok to get help from an AI, e.g. when refactoring parts of the code,
+but please always carefully reflect on the results proposed and do not “[vibe code](https://en.wikipedia.org/wiki/Vibe_coding)”. That usually does not work well nor fit the exact mathematical definitions,
+reliability and stability as well as and abstractions `Manifolds.jl` aims to provide.

NEWS.md

@@ -5,6 +5,12 @@ All notable changes to ´Manifolds.jl´ will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.11.22] unreleased
+
+### Added
+
+* A clarification on the use of AI in the [CONTRIBUTING.md](https://juliamanifolds.github.io/Manifolds.jl/stable/misc/CONTRIBUTING/) (#886)
+
 ## [0.11.21] 2025-04-03
 
 ### Changed