This article examines how written feedback is used to support the production of texts for purposes of reuse. The case study refers to an entrepreneur training program at the University of Texas at Austin. In the program, Korean startups are trained in understanding the US market, and developing pitches that convince US investors. They are supported by Quicklook® reports. A Quicklook report delivers snapshots of the market receptivity for the startup's product. Market analysts write the reports. In the final stage of drafting, program staff members supervise the report author. This study investigates how supervisors use commenting and how the goal of creating a highly reusable text source guides the feedback process. The database was examined quantitatively (frequency of drafting and commenting) and qualitatively (functional comment types). The results offer valuable insights into actual writing processes in business settings and how professionals interact to ensure a reusable product. The findings indicate a broad range of comment functions. Overall, we distinguish two main categories: feedback activities focusing on Quicklook reports as reusable resource, and feedback activities focusing on collaboration and workflow. Each category includes functional comment types. Further research is needed to learn more about professional strategies of reflecting on text quality, the quality of assessments, or the ratio between detected and real deficiencies of a document.