diff --git a/README-astrometry.md b/README-astrometry.md
index da270e3..39e1275 100644
--- a/README-astrometry.md
+++ b/README-astrometry.md
@@ -187,3 +187,8 @@ systemctl enable nova-jobs.service
 systemctl enable nova-uwsgi.service
 # reboot
 ```
+
+The API key by default:
+
+`XXXXXXXX`
+