diff --git a/README.md b/README.md
index ae4be7b..f3ee36b 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,7 @@ This applies to the Congress Center as well as your hotel windows.
 - Train/plane tickets (including verification documents for self-printed DB tickets. Check the List of accepted documents! [Welche Lichtbildausweise werden anerkannt?][41])
 - Congress tickets (printed or digital. iOS passbook/wallet, PDF)
   - have them ready before your line up at the cash desk!
+  - use PassAndroid (via [F-Droid](https://f-droid.org/packages/org.ligi.passandroid/), via [Google Play](https://play.google.com/store/apps/details?id=org.ligi.passandroid))
 - Passport or other kind of photo ID (Personalausweis)
 - Driver's license (even an international one)
 - Hotel booking