diff --git a/README b/README
index 385f50d..338895b 100644
--- a/README
+++ b/README
@@ -1,2 +1,13 @@
 This repository is meant to contain documents and tools by Guix hackers
 and maintainers that do not fit in the Guix repository.
+
+If you’re a committer, please install this pre-push hook:
+
+cat > .git/hooks/pre-push <<EOF
+#!/bin/sh
+exec guix git authenticate 8a7e10b447b574279a7016ae6ea15bc7bcd46253 "3CE4 6455 8A84 FDC6 9DB4  0CFB 090B 1199 3D9A EBB5"
+EOF
+chmod +x .git/hooks/pre-push
+
+This will check whether your commits are signed by a key listed in
+‘.guix-authorizations’ before pushing.