Tacit conditions cannot modify the agreement. This first extension period is made under conditions in accordance with this agreement and the rent to be paid to the lessor during the option period is increased by 8% of the monthly rent payable during the year that continues the option period. “A tacit provision may not be introduced into a contract concerning matters to which the parties have applied their ideas and for which they are expressly provided for in the agreement. The agreement was entered into on 7 November 2007 between Shepherd Industrial Commercial Real Estate CC (Shepherd Industrial) and the respondent, Roux Le Roux Motors CC, whereby the former leased a commercial property at the corner of Jan van Riebeek Drive and Wamkelekile Street, Paarl (the property) for the purpose of operating a petrol station. The lease began on December 1, 2007. . .