Update README.md

Author: swyxio

Diff for: README.md

@@ -421,12 +421,12 @@ Minor note: For the `identity` field, since we are not fully emulating Netlify I
 
 ## Debugging
 
-To debug lambdas, you can use the `--inspect` flag. Additionally:
+To debug lambdas, prepend the `serve` command with [npm's package runner npx](https://medium.com/@maybekatz/introducing-npx-an-npm-package-runner-55f7d4bd282b), e.g. `npx --node-arg=--inspect netlify-lambda serve ...`. 
 
 1. make sure that sourcemaps are built along the way (e.g. in the webpack configuration and the `tsconfig.json` if typescript is used)
 2. webpack's minification/uglification is turned off (see below):
 
-For example, have a file with:
+For example, to customize the webpack config you can have a file with:
 
 ```js
 // webpack.functions.js
@@ -435,7 +435,7 @@ module.exports = {
 };
 ```
 
-Then specify `netlify-lambda serve --config ./webpack.functions.js`. If using VSCode, it is likely that the `sourceMapPathOverrides` have to be adapted for breakpoints to work. Read here for more info on [how to modify the webpack config](https://github.com/netlify/netlify-lambda/issues/64#issuecomment-429625191).
+So you can run something like `npx --node-arg=--inspect netlify-lambda serve --config ./webpack.functions.js`. If using VSCode, it is likely that the `sourceMapPathOverrides` have to be adapted for breakpoints to work. Read here for more info on [how to modify the webpack config](https://github.com/netlify/netlify-lambda/issues/64#issuecomment-429625191).
 
 Netlify Functions [run in Node v8.10](https://www.netlify.com/blog/2018/04/03/node.js-8.10-now-available-in-netlify-functions/) and you may need to run the same version to mirror the environment locally. Also make sure to check that you aren't [committing one of these common Node 8 mistakes in Lambda!](https://serverless.com/blog/common-node8-mistakes-in-lambda/)