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Description
The de-facto reference for allowed keywords is in learn-astropy-librarian at https://github.com/astropy/learn-astropy-librarian/blob/main/astropylibrarian/data/keywords.yaml
The contribution guide should tell contributors what keywords are allowed and should also provide a process for how to suggest new keywords.
Note that we'd also like to adopt UAT: see #652
Also see astropy-learn/learn-astropy#20 for a general issue on updating the contribution docs.