codicil
Concise Oxford English Dictionary © 2008 Oxford University Press:
codicil /ˈkɒdɪsɪl, ˈkəʊ-/
▶noun an addition or supplement that explains, modifies, or revokes a will or part of one.
– derivatives
codicillary /ˌkɒdɪˈsɪləri/ adjective.
codicillary /ˌkɒdɪˈsɪləri/ adjective.
'codicil' also found in these Oxford entries:

