diff --git a/packages/react-chat-example/README.md b/packages/react-chat-example/README.md
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--- a/packages/react-chat-example/README.md
+++ b/packages/react-chat-example/README.md
@@ -1 +1,13 @@
-#React chat example
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+#React chat example
+
+##How to run example
+
+ 1. First you need to `yarn && yarn build` in main repo folder
+ 2. set two environment libraries
+    ENV and COMMUNITY_KEY
+
+    `export ENV=test` to use waku test fleet
+    `export ENV=prod` to use waku prod fleet
+    `export COMMUNITY_KEY=0x038ff8c6539ff268e024d07534a362ef69f7b13b056fcf19177fb6282b4d547bc8` to set a key to community
+
+  3. run `yarn start` in `packages/react-chat-example` folder.
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