It's a bit frustrating when you deliver a ziped-up software package to a customer, go through the trouble of including a readme in the root of the archive that documents the folder structure, has a short description what this particular part is used for and in which exact file in the zip the detailed documentation for that part can be found, then point out in the mail carrying the download link that all documentation is included and that their exact location is noted in the readme at the root of the file, and then have the customers developer sending you a mail asking you if there is any documentation.
I can only assume he somehow didn't get the whole file from the sysadmin.