Add alternative test framework setup

README.md

@@ -119,6 +119,24 @@ Add jest-extended to your Jest setupTestFrameworkScriptFile configuration. [See
 }
 ```
 
+If you are already using another test framework, like [jest-chain](https://github.com/mattphillips/jest-chain), then you should create a test setup file and `require` each of the frameworks you are using.
+
+For example:
+
+```js
+// ./testSetup.js
+require('jest-extended');
+require('any other test framework libraries you are using');
+```
+
+Then in your Jest config:
+
+```json
+"jest": {
+  "setupTestFrameworkScriptFile": "./testSetup.js"
+}
+```
+
 ## API
 
 #### .pass(message)