Correct key to configure watched sources

Author: novemberborn

docs/recipes/watch-mode.md

@@ -67,7 +67,7 @@ In AVA there's a distinction between *source files* and *test files*. As you can
 
 By default AVA watches for changes to the test files, snapshot files, `package.json`, and any other `.js` files. It'll ignore files in [certain directories](https://github.com/novemberborn/ignore-by-default/blob/master/index.js) as provided by the [`ignore-by-default`] package.
 
-You can configure patterns for the source files in the [`ava` section of your `package.json`, or `ava.config.js` file][config], using the `source` key.
+You can configure patterns for the source files in the [`ava` section of your `package.json`, or `ava.config.js` file][config], using the `sources` key.
 
 You can specify patterns to match files in the folders that would otherwise be ignored, e.g. use `node_modules/some-dependency/*.js` to specify all `.js` files in `node_modules/some-dependency` as a source, even though normally all files in `node_modules` are ignored. Note that you need to specify an exact directory; `{bower_components,node_modules}/**/*.js` won't work.