What is the use case? What do you mean by "an update", any field? That can add a significant load on the system. You could build a condition to check if a list of fields has changed and the trigger the comment.

What is the use case? What do you mean by "an update", any field? That can add a significant load on the system. You could build a condition to check if a list of fields has changed and the trigger the comment.

This is an internal process in our company where we need to keep track on every update on the ticket that is being made. For example, even if the engineer is changing the status to Pending vendor, he needs to explain the situation in words also. 

Note that we used work in Service Manager, & the management wanted to implement the same thing.