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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -4,6 +4,12 @@ Connect people through any URL
 
 ## Extension
 
+First, make sure to build the plugin. From the extension's root you can call:
+
+```
+$ yarn install && yarn build
+```
+
 ### Testing on Firefox
 
 In order to test on firefox, first go to `about:debugging`, then click