Using patch to update a Sharepoint list item

Good morning all you wonderful Power People!. I have created an FLT app for my company where jobs can be picked up/allocated to the various types of FLT used within the business. I am now expanding on this so that Supervisors can send messages to the drivers - a very basic IM system. At the moment the system creates a specific job type (Supervisor Request) which appears in the FLT Job List.

My question is this. Can i use the Patch function to add data into the Comments field (which can be set to add comments to an existing record) or will this just overwrite any existing comments that are on the record? If it does, is there a better method of adding comments so that the chain of Comments can be seen?

As always, many thanks for all help and suggestions offered

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