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extras/README.md

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+# /extras
+
+Mounted read-only into the Minecraft container at `/extras`.
+
+## Required files
+
+- `authlib-injector.jar` — download latest from
+  https://github.com/yushijinhun/authlib-injector/releases
+- `modrinth-mods.txt` — one Modrinth project slug per line
+
+## Optional
+
+- `cf-mods.txt` — CurseForge mod file IDs, only if `CF_API_KEY` is set