README.md in rubocop-performance-1.3.0 vs README.md in rubocop-performance-1.4.0

@@ -30,9 +30,17 @@
 
 ```yaml
 require: rubocop-performance
 ```
 
+Alternatively, use the following array notation when specifying multiple extensions.
+
+```yaml
+require:
+  - rubocop-other-extension
+  - rubocop-performance
+```
+
 Now you can run `rubocop` and it will automatically load the RuboCop Performance
 cops together with the standard cops.
 
 ### Command line