def add_inote(self, msg, idx, off=None):
if self.code != None:<EOL><INDENT>self.code.add_inote(msg, idx, off)<EOL><DEDENT>
Add a message to a specific instruction by using (default) the index of the address if specified

:param msg: the message
:type msg: string
:param idx: index of the instruction (the position in the list of the instruction)
:type idx: int
:param off: address of the instruction
:type off: int