diff --git a/Package-format.md b/Package-format.md
index 1c83575..069efb3 100644
--- a/Package-format.md
+++ b/Package-format.md
@@ -85,4 +85,21 @@ With a `manifest.json` pointing at the filename like:
 }
 ```
 
-These packages are supposed to be hooked into the game, and into amdaemon. All DLL fields are optional, therefore it's fine to only provide a DLL for the game, or only for amdaemon. `game32` and `game64` can be used by packages that target both CHUNITHM (32-bit) and O.N.G.E.K.I. (64-bit).
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+These packages are supposed to be hooked into the game, and into amdaemon. All DLL fields are optional, therefore it's fine to only provide a DLL for the game, or only for amdaemon. `game32` and `game64` can be used by packages that target both CHUNITHM (32-bit) and O.N.G.E.K.I. (64-bit).
+
+## Local packages
+
+In `%LOCALAPPDATA%/STARTLINER/data/pkg`, create a `local-PackageName` directory, and create a `manifest.json` with an additional `games` entry:
+```json
+{
+    "name": "PackageName",
+    "version_number": "1.0.0",
+    "website_url": "",
+    "description": "Example custom aimeio",
+    "dependencies": [],
+    "installers": [{ "identifier": "segatools", "module": "aimeio" }],
+    "games": ["ongeki", "chunithm"]
+}
+```
+
+`name` must match the name of the directory after the hyphen.
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