paragraph 197 in volume 2, chapter 12, The Compulsory Jurisdiction (Optional Clause)
No conditions of language or form are prescribed for declarations accepting the compulsory jurisdiction.1 As the Court has explained, the emphasis is placed on intention, and a State wishing to accept the compulsory jurisdiction is free to choose any form provided its intention clearly results from it.
The only formality required [in the case of an acceptance of the compulsory jurisdiction] is the deposit of the acceptance with the Secretary-General of …