updated README.md

I know its obvious to run npm install inside the source but beginners do mess things up.
phaserjs · Oct 25, 2018 · a3a124a · a3a124a
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@@ -305,7 +305,7 @@ Read our [comprehensive guide](https://phaser.io/phaser3/devlog/127) on creating
 
 ### Building from Source
 
-If you wish to build Phaser 3 from source, ensure you have the required packages by cloning the repository and then running `npm install`.
+If you wish to build Phaser 3 from source, ensure you have the required packages by cloning the repository and then running `npm install` on your source directory.
 
 You can then run `webpack` to create a development build in the `build` folder which includes source maps for local testing. You can also `npm run dist` to create a minified packaged build in the `dist` folder. For a list of all commands available use `npm run help`.