Update "Usage with frontend" section (#946)

opencollective · Sep 18, 2023 · e9b4ac0 · e9b4ac0 · vercel · Sep 18, 2023
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@@ -68,7 +68,7 @@ The page will auto-refresh everytime a change is made.
 
 #### Usage with frontend
 
-If you use this service through local frontend, you're ready to go - frontend will pass your authorization token directly to the app.
+If you use this service through local frontend, you will need to add `PDF_SERVICE_URL=http://localhost:3002` line to `.env`. You're ready to go - frontend will pass your authorization token directly to the app.
 
 However this is not practical to develop, you should only use it to debug the
 bridge between the two services.