diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 2dc7117a..f0c3a517 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -48,13 +48,28 @@ The app is partially modularized by feature layers. The older parts of the app a
 
 
 ### Project setup
-1. Create your own debug signing key in `config/debug_signing.jks`
+1. Create your own debug signing key in `config/debug_signing.jks` (example below)
 2. Create `config/config.properties` file with your debug key alias and password:
 ```
 debug.storePassword=
 debug.keyAlias=
 debug.keyPassword=
 ```
-3. Comment out `id("com.google.gms.google-services")` plugin in `app/build.gradle.kts`. This is needed to disable Firebase services (we do not share `google-services.json` in the repository).
+3. Comment out (`//`) `id("com.google.gms.google-services")` and `id("com.google.firebase.crashlytics")` plugins in `app/build.gradle.kts`. Also comment out `FirebaseCrashlytics.getInstance().setCrashlyticsCollectionEnabled(sendCrashLogsPreference.get())` in `app/src/main/java/com/twofasapp/App.kt`. This is needed to disable Firebase services (we do not share `google-services.json` in the repository) and to prevent the app from crashing on startup due to uninitialized Firebase.
+
+We've tested the build process on Java 17.
+
+#### Example signing key generation
+
+You can use the commands below to generate a sample signing keystore and create `config.properties`.
+
+```bash
+keytool -genkey -v -keystore config/debug_signing.jks -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000 -dname "C=US, O=Android, CN=Android Debug"
+cat >config/config.properties <<EOF
+debug.storePassword=android
+debug.keyAlias=androiddebugkey
+debug.keyPassword=android
+EOF
+```
 
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