diff --git a/.env.example b/.env.example
index 1dac358..15fcd60 100644
--- a/.env.example
+++ b/.env.example
@@ -34,3 +34,8 @@
 # Host and port to listen on
 SPOOLMAN_HOST=0.0.0.0
 SPOOLMAN_PORT=7912
+
+
+# Enable Collect Prometheus metrics at database
+# Default: FALSE
+#SPOOLMAN_METRICS_ENABLED=TRUE