diff --git a/README.md b/README.md
index 2305022..72ec2d6 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,14 @@
+# Refile M4B
+
+## Usage
+
+```bash
+refile-m4b DIR
+```
+
+This will refile all the `*.m4b` files in `DIR` and it's subdirectories by author, series (if given) and title.
+The information in each files metadata is used.
+
 ## dependencies
 
 ### debian
@@ -5,3 +16,5 @@
 ```bash
 sudo apt install libtag1-dev libtagc0-dev
 ```
+
+> Due to a typo, this was previously known as refile-mp4.