diff --git a/README.md b/README.md
index 9922c93..8018304 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,11 @@
-# Library template
-Basic template to create a TypeScript library that works properly when included
+# Config
+Describe the configuration you expect and let this lib parse it from env variables or files.
 
-## How to split in multiple file
-Technically, there is nothing to do, but if you want to allow sub-imports, you have to :
-
-1. In `package.json`, under `exports`, add `"./submodule": "./src/submodule.ts"`
-2. In `tsconfig.json`, under `paths`, add  `"lib-name/*": ["./src/*"]`
+## File parsing
+1. Add `__FILE` (note the **2** `_`) at the end of any variable name
+2. Set a path to a file as a value
+3. The parser will
+    1. Read the path
+    2. Read the file
+    3. Trim any leading or trailing whitespace
+    4. Use the value for the config