diff --git a/backups/authenticator.sh b/backups/authenticator.sh
index f292315..33cd3b7 100755
--- a/backups/authenticator.sh
+++ b/backups/authenticator.sh
@@ -1,5 +1,6 @@
 #!/bin/sh
 
+# adopted from https://wiki.archlinux.org/index.php/Google_Authenticator
 # This is the path to the Google Authenticator app file.  It's typically located
 # in /data under Android.  Copy it to your PC in a safe location and specify the
 # path to it here.