diff --git a/cmd/postgres_exporter/postgres_exporter.go b/cmd/postgres_exporter/postgres_exporter.go
index af973d5d..fea2e2b2 100644
--- a/cmd/postgres_exporter/postgres_exporter.go
+++ b/cmd/postgres_exporter/postgres_exporter.go
@@ -212,15 +212,15 @@ var builtinMetricMaps = map[string]intermediateMetricMap{
 	},
 	"pg_stat_replication": {
 		map[string]ColumnMapping{
-			"procpid":          {DISCARD, "Process ID of a WAL sender process", nil, semver.MustParseRange("<9.2.0")},
-			"pid":              {DISCARD, "Process ID of a WAL sender process", nil, semver.MustParseRange(">=9.2.0")},
-			"usesysid":         {DISCARD, "OID of the user logged into this WAL sender process", nil, nil},
-			"usename":          {DISCARD, "Name of the user logged into this WAL sender process", nil, nil},
-			"application_name": {LABEL, "Name of the application that is connected to this WAL sender", nil, nil},
-			"client_addr":      {LABEL, "IP address of the client connected to this WAL sender. If this field is null, it indicates that the client is connected via a Unix socket on the server machine.", nil, nil},
-			"client_hostname":  {DISCARD, "Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when log_hostname is enabled.", nil, nil},
-			"client_port":      {DISCARD, "TCP port number that the client is using for communication with this WAL sender, or -1 if a Unix socket is used", nil, nil},
-			"backend_start": {DISCARD, "with time zone	Time when this process was started, i.e., when the client connected to this WAL sender", nil, nil},
+			"procpid":                  {DISCARD, "Process ID of a WAL sender process", nil, semver.MustParseRange("<9.2.0")},
+			"pid":                      {DISCARD, "Process ID of a WAL sender process", nil, semver.MustParseRange(">=9.2.0")},
+			"usesysid":                 {DISCARD, "OID of the user logged into this WAL sender process", nil, nil},
+			"usename":                  {DISCARD, "Name of the user logged into this WAL sender process", nil, nil},
+			"application_name":         {LABEL, "Name of the application that is connected to this WAL sender", nil, nil},
+			"client_addr":              {LABEL, "IP address of the client connected to this WAL sender. If this field is null, it indicates that the client is connected via a Unix socket on the server machine.", nil, nil},
+			"client_hostname":          {DISCARD, "Host name of the connected client, as reported by a reverse DNS lookup of client_addr. This field will only be non-null for IP connections, and only when log_hostname is enabled.", nil, nil},
+			"client_port":              {DISCARD, "TCP port number that the client is using for communication with this WAL sender, or -1 if a Unix socket is used", nil, nil},
+			"backend_start":            {DISCARD, "with time zone	Time when this process was started, i.e., when the client connected to this WAL sender", nil, nil},
 			"backend_xmin":             {DISCARD, "The current backend's xmin horizon.", nil, nil},
 			"state":                    {LABEL, "Current WAL sender state", nil, nil},
 			"sent_location":            {DISCARD, "Last transaction log position sent on this connection", nil, semver.MustParseRange("<10.0.0")},