diff --git a/README.md b/README.md
index cbd32fd..360e91a 100644
--- a/README.md
+++ b/README.md
@@ -14,11 +14,28 @@ For now, it only supports:
 
 ## Usage
 
-```
+```sh
 cargo install kanshi
+touch ~/.config/kanshi/config
 kanshi > ~/.config/sway/outputs
 ```
 
+### Configuration file
+
+Each monitor configuration is delimited by brackets. Each line has the same
+syntax as `sway(5)`.
+
+```
+{
+	output LVDS-1 disable
+	output VGA-1 resolution 1600x900 position 0,0
+}
+
+{
+	output LVDS-1 vendor CMN product 0x1484 serial 0x0 resolution 1600x900 scale 2
+}
+```
+
 ## License
 
 MIT