diff --git a/man/backupninja.conf.5 b/man/backupninja.conf.5
index ff6b055330097a4a24ff0fd0c4606318f3965324..286adeaad6f5b96d4c721f81d089e15490a8b24f 100644
--- a/man/backupninja.conf.5
+++ b/man/backupninja.conf.5
@@ -42,6 +42,11 @@ How verbose to make the logs.
 .br
 1 = Fatal errors
 
+.TP
+.B reportprom
+Produce prometheus metrics of backup status. Requires `prometheus-node-exporter`
+to be installed.
+
 .TP
 .B reportemail
 Send a summary of the backup status to this email address.