diff --git a/package.json b/package.json
index 1c1577b..3cd58db 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "svg-radar-chart",
 	"description": "A reusable radar chart in SVG.",
-	"version": "0.2.3",
+	"version": "1.0.0",
 	"type": "module",
 	"main": "index.js",
 	"files": [
diff --git a/readme.md b/readme.md
index 2a290a1..2b5bfe4 100644
--- a/readme.md
+++ b/readme.md
@@ -104,8 +104,8 @@ radar(columns, data, {
 
 ## API
 
-```
-radar(columns, data, [opt])
+```js
+radar(columns, data, opt = {})
 ```
 
 `columns` must be an object. The values are captions.