diff --git a/.document/METRICS.md b/.document/METRICS.md
index b717199..28548f6 100644
--- a/.document/METRICS.md
+++ b/.document/METRICS.md
@@ -1,5 +1,7 @@
 # Metrics
 
+This is only for schedule backup job.
+
 ## Successful backups counter
 
 ```bash