In general terms, an amendment would be to the effect that no legislation could operate so as to infringe parliamentary privilege unless expressly provided for in a specific statute. So the constitutional status of privilege would be clearly stated.
In practical terms, if you applied that concept to the Access to Information Act, without an amendment a request would come to the House as a third party, but as part of the process, the Information Commissioner would have to consider the documents, and privilege would be considered. That would be clearly stated in the law, which is not the case right now.