It is always be a good practice to add a note or comment to any Oracle parameter changes. So, in future, your Oracle database administrator will know what reason, caused of the parameter changes.
1. To add comment, execute below command,
ALTER SYSTEM SET audit_sys_operations=TRUE COMMENT='Audit Activity December 2013' SCOPE=SPFILE;
2. You can track the comment on your SPFILE using below command.
> strings spfileSID.ora | grep audit *.audit_sys_operations='TRUE'#Audit Activity December 2013
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