Extending-Models.md

@@ -3,7 +3,16 @@
 ## Getting the class mixin function
 The class mixers can be accessed in two ways, the first being:
 ```javascript
+import { associationMixer, Association } from '@openrailuk/common';
+
+associationMixer(yourMixin);
+```
+or you can use
+```javascript
 import * as common from '@openrailuk/common';
 
-common.associationMixer
+common.associationMixer(yourMixin);
 ```
+
+An example usage of the mixins can be found at this snippet:
+<script src="https://gitlab.com/openrail/uk/common-nodejs/snippets/1723609.js"></script>
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