Write into
Definition 1 of 3
Pro Tip 1/3Contract Precision
Used when specifying the exact terms you want legally recognized. 
They decided to write into the lease specific penalties for late rent payments.
Pro Tip 2/3Future Amendments
Allows for clarity on changes or additions that might be needed later. 
The company will write into the agreement a clause for future technological upgrades.
Pro Tip 3/3Binding Commitment
Indicates the seriousness and enforceability of the written terms. 
The non-disclosure terms were written into the employee contracts.