diff --git a/plugins/postgresql/postgresql.go b/plugins/postgresql/postgresql.go
index a7a8d1acd..007ac20bf 100644
--- a/plugins/postgresql/postgresql.go
+++ b/plugins/postgresql/postgresql.go
@@ -26,13 +26,17 @@ var sampleConfig = `
 	[[postgresql.servers]]
 
 	# specify address via a url matching:
-	#   postgres://[pqgotest[:password]]@localhost?sslmode=[disable|verify-ca|verify-full]
+	#   postgres://[pqgotest[:password]]@localhost[/dbname]?sslmode=[disable|verify-ca|verify-full]
 	# or a simple string:
-	#   host=localhost user=pqotest password=... sslmode=...
+	#   host=localhost user=pqotest password=... sslmode=... dbname=app_production
 	#
 	# All connection parameters are optional. By default, the host is localhost
 	# and the user is the currently running user. For localhost, we default
 	# to sslmode=disable as well.
+    # Without the dbname parameter, the driver will default to a database
+    # with the same name as the user. This dbname is just for instantiating a
+    # connection with the server and doesn't restrict the databases we are trying
+    # to grab metrics for.
 	#
 
 	address = "sslmode=disable"