Updated README

README.md

@@ -361,6 +361,10 @@ In comparison to `serverless offline`, the `start` command will fire an `init` a
 
 You can find an example setup in the [`examples`][link-examples] folder.
 
+By default the plugin starts in watch mode when triggered through `serverless offline`, i.e.
+it automatically recompiles your code if it detects a change in the used sources.
+After a change it might take some seconds until the emulated endpoints are updated.
+
 If you have your sources located on a file system that does not offer events,
 e.g. a mounted volume in a Docker container, you can enable polling with the
 `--webpack-use-polling=<time in ms>` option. If you omit the value, it defaults
@@ -389,6 +393,9 @@ Run `serverless offline start`.
 You can reduce the clutter generated by `serverless-offline` with `--dontPrintOutput` and
 disable timeouts with `--noTimeout`.
 
+If you use serverless offline to run your integration tests, you might want to
+disable the automatic watch mode with the `--webpack-no-watch` switch.
+
 ### Bundle with webpack
 
 To just bundle and see the output result use: