Update README.md

Lizz-2023 · Apr 24, 2021 · d9acc08 · d9acc08
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 * Some authorizations by authors can be found [here](https://github.com/bmatthiesen/IRS-continuous/issues/1) and [here](https://github.com/emilbjornson/IRS-relaying/issues/1).
 
-* We also have WeChat group for RIS(IRS). If you want to join, please send your WeChat ID to kewang0225@gmail.com. 
+* We also have WeChat group for RIS(IRS). If you want to join, please send your WeChat ID to kewang0225@gmail.com. In the email, please state your real name and school. 
 
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