diff --git a/API.md b/API.md
index 7f0f1fb..4278715 100755
--- a/API.md
+++ b/API.md
@@ -167,11 +167,11 @@ Asserts that the reference value is an error. You can provide optional requireme
 const Code = require('code');
 const expect = Code.expect;
 
-const err = new Error('Oops an error occured.');
+const err = new Error('Oops an error occurred.');
 expect(err).to.be.an.error();
 expect(err).to.be.an.error(Error);
-expect(err).to.be.an.error('Oops an error occured.');
-expect(err).to.be.an.error(Error, /occured/);
+expect(err).to.be.an.error('Oops an error occurred.');
+expect(err).to.be.an.error(Error, /occurred/);
 ```
 
 ##### `function()`