diff --git a/API.md b/API.md
index 35e2d2e..ad25b64 100644
--- a/API.md
+++ b/API.md
@@ -4,7 +4,7 @@
  
 <a name="viewbox"></a>
 # viewbox
-should be able to create a new empty viewbox.
+should be able to create a new viewbox.
 
 ```js
 var result = viewbox.create()
@@ -72,3 +72,38 @@ expect(result).to.eql({
 })
 ```
 
+should output a 0 size rectangle for something falsey.
+
+```js
+var result = viewbox.rect()
+expect(result).to.eql({
+  x: 0,
+  y: 0,
+  width: 0,
+  height: 0
+})
+```
+
+should be able to generate a viewbox string.
+
+```js
+var box = [1, 2, 3, 4]
+var result = viewbox.asString(box)
+expect(result).to.equal('1 2 3 4')
+```
+
+should output a new viewbox as a 0 size viewbox string.
+
+```js
+var box = viewbox.create()
+var result = viewbox.asString(box)
+expect(result).to.equal('0 0 0 0')
+```
+
+should output something falsey as a 0 size viewbox string.
+
+```js
+var result = viewbox.asString()
+expect(result).to.equal('0 0 0 0')
+```
+
diff --git a/package.json b/package.json
index 156c3e8..7b9ca3a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "viewbox",
-  "version": "0.0.0",
+  "version": "1.0.0",
   "description": "Library for dealing with SVG viewboxes as plain arrays",
   "main": "index.js",
   "directories": {