Update README.md

packages/flutter/README.md

@@ -75,14 +75,15 @@ expects to be run from the root directory of your application's package (i.e.,
 the same directory that contains the `pubspec.yaml` file). To run your app,
 follow these instructions:
 
- - `./packages/sky/sky_tool start` to start the dev server and upload your
-   app to the device.
-   (NOTE: add a `--install` flag to install `SkyShell.apk` if it is not already
-   installed on the device.)
-
- - Use `adb logcat` to view any errors or Dart `print()` output from the app.
-   `adb logcat -s sky` can be used to filter only adb messages from
-   `SkyShell.apk`.
+ - The first time: `./packages/sky/sky_tool start --install && adb logcat -s sky chromium`
+
+ - Subsequent times: `./packages/sky/sky_tool start && adb logcat -s sky chromium`
+
+The `sky_tool start` command starts the dev server and uploads your app to the device.
+The `--install` flag installs `SkyShell.apk` if it is not already installed on the device.
+The `adb logcat` command logs errors and Dart `print()` output from the app. The `-s sky chromium`
+argument limits the output to just output from Sky Dart code and the Sky Engine C++ code (which
+for historical reasons currently uses the tag `chromium`.)
 
 Debugging
 ---------