diff --git a/README.md b/README.md
index 1da1c32..34fc5c3 100644
--- a/README.md
+++ b/README.md
@@ -75,8 +75,10 @@ User/org management requires a PocketBase **superuser service account** in
    ```
    Open http://localhost:8090 and sign in.
 4. **Fly App** — see [`Fly App/README.md`](Fly%20App/README.md) (install Flutter
-   + JDK, set your DJI App Key in `android/gradle.properties`, `flutter run` on a
-   connected Android device — the DJI SDK does not run on emulators).
+   + JDK, put your DJI App Key in `~/.gradle/gradle.properties` as
+   `PILOTVAULT_FLY_API_KEY` — deliberately outside the repo, so it is never
+   committed — then `flutter run` on a connected Android device; the DJI SDK
+   does not run on emulators).
 
 ### Docker