I have committed new project[enhance project] in last week. Client already having the application with source code. so, I need to modify the coding as per the client requirements. I gathered client requirements ASAP. now, I need to submit SRS[System Requirement Specification]. For the new project I am having format SRS and SDD. I don't know to prepare SRS & SDD for existing project.
Note: Client does not have SRS & SDD of previous.