There are several ways you can contribute to the documentation of Firebird, or Firebird in general:

• Participate on the mailing lists (see https://www.firebirdsql.org/en/mailing-lists/)

• Report bugs or submit pull requests on GitHub (https://github.com/FirebirdSQL/)

• Become a developer (contact us on firebird-devel)

• Donate to the Firebird Foundation (see https://www.firebirdsql.org/en/donate/)

• Become a paying member or sponsor of the Firebird Foundation (see https://www.firebirdsql.org/en/firebird-foundation/)