diff --git a/README.md b/README.md
index 5d14c80..d929790 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,21 @@
 # Janet
 
-A NodeJS-based IRC bot
\ No newline at end of file
+A NodeJS-based IRC bot
+
+## Config
+
+Configuration is stored in `config.json`. Example configuration file:
+
+```
+{
+  "irc": {
+    "server": "localhost",
+    "port": 6667,
+    "user": "Janet",
+    "channels": [
+      "#channel1".
+      "#channel2"
+    ]
+  }
+}
+```