Service workers note (#10276)

* Service workers note - Adding a note that informs readers that the service workers will only register on a production build. - I was confused and I had to dig into the source code to find out why they weren't working on develop * Update docs/docs/add-offline-support-with-a-service-worker.md Agreed Co-Authored-By: danielcooke1996 <[email protected]>
gatsbyjs · Dec 6, 2018 · 8ccd222 · 8ccd222
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diff --git a/docs/docs/add-offline-support-with-a-service-worker.md b/docs/docs/add-offline-support-with-a-service-worker.md
@@ -41,6 +41,8 @@ Add this plugin to your `gatsby-config.js`
 
 That's all you need to add offline support to your Gatsby site.
 
+Note: Service worker registers only in production builds (`gatsby build`).
+
 ## References
 
 - [Service Workers: an Introduction](https://developers.google.com/web/fundamentals/primers/service-workers/)