diff --git a/roles/copr/keygen/files/backup_keyring.sh b/roles/copr/keygen/files/backup_keyring.sh
index fec11d7f70..53327f2431 100644
--- a/roles/copr/keygen/files/backup_keyring.sh
+++ b/roles/copr/keygen/files/backup_keyring.sh
@@ -1,8 +1,14 @@
 #!/bin/sh
 
-# used as root
-# root gpg keychain should have PUBLIC key with `user name` copr-keygen-backup-key
-# (per https://pagure.io/fedora-infrastructure/issue/8904)
+# - used as root
+# - executed hourly, overwriting the "daily file" in /backup dir
+# - the Fedora Infra backup mechanism pulls that file, overwriting its own
+#   "daily" copy
+# - it means we should always have at most a 24h-old backup
+# - the root gpg keychain should have PUBLIC key with `user name`
+#   copr-keygen-backup-key, per
+#   https://pagure.io/fedora-infrastructure/issue/8904
+# - fixed in https://github.com/fedora-copr/copr/issues/3532
 
 PATH_TO_KEYRING_DIR="/var/lib/copr-keygen"
 BACKUP_DIR=/backup