diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -5,3 +5,8 @@ A mathematical puzzle game. Try it at https://mwageringel.github.io/everest/
 ## Build dependencies
 
 Building with `make` requires `flutter, curl, rsvg-convert, imagemagick`.
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+APK signing certificate fingerprint (SHA-256):
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+    576bae61b2aba5d1d32a17d373baa36e05beaaefb67d9b47218d004c0e8333d9