message: tell OSS users about TRACE
  Summary:
  TRACE is useful to figure out statistics about a pass.
  Let's tell people how to use it :)
diff: @@ -77,7 +77,13 @@ To use ReDex, first build your app and find the APK for it. Then run:
  ```
  redex path/to/your.apk -o path/to/output.apk
  ```
  -With any luck, the result `output.apk` should be smaller and faster than the
  +
  +If you want some statistics about each pass, you can turn on tracing:
  +```
  +export TRACE=1
  +```
  +
  +The result `output.apk` should be smaller and faster than the
  input. Enjoy!
  # Documentation
  