As per 1 January 2015, an employer is no longer allowed to include a non-competition clause in fixed term contracts, unless substantial business interests make it necessary to include such a clause. The substantial business interests must be specified in the non-competition clause. The first case law on this subject shows that the substantial business interests must be set out in concrete terms. A description of the tasks and activities of the employee should also be inserted in the clause. Furthermore, the know-how and/or (sensitive) corporate information, which the employee shall gain, must be specified.