Codicil
/ˈkɑːdəsl/
Definition 1 of 1
Pro Tip 1/3Legal Documents
A codicil is strictly used in legal contexts, often related to estate planning and wills. 
My grandfather's lawyer advised him to make a codicil to address his latest asset changes.
Pro Tip 2/3Not a Standalone
Codicils must reference a main will and cannot act as independent legal documents. 
The attorney explained that the codicil should specify which part of the original will it amends.
Pro Tip 3/3Specific Changes
Use 'codicil' when referring to specific alterations, not the creation of an entirely new will. 
After purchasing a new home, she added a codicil to her will rather than rewriting it entirely.