Update readme.md

sindresorhus · Jun 14, 2014 · eb65ef4 · eb65ef4
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diff --git a/readme.md b/readme.md
@@ -28,6 +28,8 @@ semverRegex().exec('unicorn 1.0.0 rainbow')[0];
 //=> ['1.0.0', '2.1.3']
 ```
 
+*It's a function so you can create multiple instances. Regexes with the global flag will have the `.lastIndex` property changed for each call to methods on the instance. Therefore reusing the instance with multiple calls will not work as expected for `.test()`.*
+
 
 ## License