Depends on Include = /etc/repositories.d/*.conf is appended to pacman.conf

$ prm list
Available repositories:

    Maintainer: George Rawlinson
    Description: AUR packages maintained by the user as well as some experimental packages.
    Key-ID: 9D120F4AAF400B8313A87EF2369552B2069123EE

    Maintainer: Orhun Parmaksiz
    Description: Personal repository with AUR and custom packages.
    Key-ID: N/A

$ prm select grawlinson
Writing to /etc/repositories.d/grawlinson.conf

$ prm show
Selected repositories:

* [grawlinson]