Added note about common issue (#262 #266)

inversify · Jun 23, 2016 · 5a51b0c · 5a51b0c
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@@ -90,6 +90,8 @@ The relect-metadata polyfill can be importing as follows:
 import "relect-metadata";
 ```
 
+> **The `relect-metadata` polyfill should be be imported only once in your entire application** because the Reflect object is mean to be a global singleton. More details about this can be found [here](https://github.com/inversify/InversifyJS/issues/262#issuecomment-227593844).
+
 InversifyJS requires the following TypeScript compilation options in your `tsconfig.json` file:
 
 ```