noah@TEAPOT-BARON-TYBURN:~/code/NixOS-Home-Network$ tree overlays/
overlays/
├── all-seeing-eye
│   └── overlays.nix
├── laundry
└── teapot
    └── overlays.nix

-----------
all-seeing-eye overlays.nix:
-----------

self: super:

  {
    rss-bridge = super.callPackage ../../pkgs/rss-bridge/default.nix {};
  }

-------
from overlay dir:
------
noah@TEAPOT-BARON-TYBURN:~/code/NixOS-Home-Network/overlays/all-seeing-eye$ ls ../../pkgs/rss-bridge/default.nix
../../pkgs/rss-bridge/default.nix