Update README.md

google · Apr 5, 2016 · 761c1aa · 761c1aa
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@@ -24,5 +24,6 @@ WALT is designed to measure the latency of physical sensors and outputs on phone
   differing clock frequencies. This means they will go out of sync after
   several minutes. The workaround is to use the app to re-sync the
   clocks. Some, but not all tests in the app will sync the clocks when starting a measurement.
+* The Android app uses some native code. In order to build it run `ndk-build` in `<repo root>/android/WALT/app/src/main` before building in Android Studio.
 * Python code used to communicate with WALT from Linux and ChromeOS can be found
   [here](https://chromium.googlesource.com/chromiumos/platform/touchbot/+/master/quickstep/)