diff --git a/flog.go b/flog.go
index d6e1f24..c637c3c 100644
--- a/flog.go
+++ b/flog.go
@@ -122,6 +122,8 @@ func NewLog(format string, t time.Time) string {
 		return NewApacheErrorLog(t)
 	case "rfc3164":
 		return NewRFC3164Log(t)
+	case "rfc5424":
+		return NewRFC5424Log(t)
 	default:
 		return ""
 	}
diff --git a/flog_test.go b/flog_test.go
index 91e9b44..c71f2f4 100644
--- a/flog_test.go
+++ b/flog_test.go
@@ -21,12 +21,14 @@ func ExampleNewLog() {
 	fmt.Println(NewLog("apache_combined", created))
 	fmt.Println(NewLog("apache_error", created))
 	fmt.Println(NewLog("rfc3164", created))
+	fmt.Println(NewLog("rfc5424", created))
 	fmt.Println(NewLog("unknown", created))
 	// Output:
 	// 222.83.191.222 - Kozey7157 697 [2018-04-22T09:30:00Z] "DELETE /innovate/next-generation" 302 24570
 	// 174.144.199.149 - Mosciski7760 386 [2018-04-22T09:30:00Z] "GET /networks/revolutionary" 204 70360 "https://www.directeyeballs.org/streamline" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_7) AppleWebKit/5312 (KHTML, like Gecko) Chrome/37.0.821.0 Mobile Safari/5312"
 	// [2018-04-22T09:30:00Z] [tempore:warn] [pid 7401:tid 4039] [client: 184.155.77.136] Try to synthesize the SMS capacitor, maybe it will compress the online program!
 	// <25>Apr 22 09:30:00 Fay5424 Monitored[5455]: Try to reboot the SMS bandwidth, maybe it will synthesize the mobile transmitter!
+	// <118>2 2018-04-22T09:30:00.000Z legacyb2b.com toolset 8605 ID854 - Try to synthesize the JBOD matrix, maybe it will calculate the 1080p application!
 	//
 }
 
diff --git a/log.go b/log.go
index cda7d86..f898a14 100644
--- a/log.go
+++ b/log.go
@@ -16,6 +16,8 @@ const (
 	ApacheErrorLog = "[%s] [%s:%s] [pid %d:tid %d] [client: %s] %s"
 	// RFC3164Log : <priority>{timestamp} {hostname} {application}[{pid}]: {message}
 	RFC3164Log = "<%d>%s %s %s[%d]: %s"
+	// RFC5424Log : <priority>{version} {iso-timestamp} {hostname} {application} {pid} {message-id} {structured-data} {message}
+	RFC5424Log = "<%d>%d %s %s %s %d ID%d %s %s"
 )
 
 // NewApacheCommonLog creates a log string with apache common log format
@@ -76,3 +78,19 @@ func NewRFC3164Log(t time.Time) string {
 		gofakeit.HackerPhrase(),
 	)
 }
+
+// NewRFC5424Log creates a log string with syslog (RFC5424) format
+func NewRFC5424Log(t time.Time) string {
+	return fmt.Sprintf(
+		RFC5424Log,
+		gofakeit.Number(0, 191),
+		gofakeit.Number(1, 3),
+		t.Format(RFC5424),
+		gofakeit.DomainName(),
+		gofakeit.BuzzWord(),
+		gofakeit.Number(1, 10000),
+		gofakeit.Number(1, 1000),
+		"-", // TODO: structured data
+		gofakeit.HackerPhrase(),
+	)
+}
diff --git a/log_test.go b/log_test.go
index e557ddc..b2b7f95 100644
--- a/log_test.go
+++ b/log_test.go
@@ -53,3 +53,14 @@ func ExampleNewRFC3164Log() {
 	fmt.Println(NewRFC3164Log(created))
 	// Output: <24>Apr 22 09:30:00 Moen8727 concept[3160]: If we back up the program, we can get to the SSL sensor through the redundant SAS program!
 }
+
+func ExampleNewRFC5424Log() {
+	rand.Seed(11)
+
+	monkey.Patch(time.Now, func() time.Time { return stopped })
+	defer monkey.Unpatch(time.Now)
+
+	created := time.Now()
+	fmt.Println(NewRFC5424Log(created))
+	// Output: <24>3 2018-04-22T09:30:00.000Z futurefunctionalities.biz info-mediaries 9030 ID160 - If we back up the program, we can get to the SSL sensor through the redundant SAS program!
+}
diff --git a/option.go b/option.go
index 4ec82d0..647e908 100644
--- a/option.go
+++ b/option.go
@@ -16,7 +16,7 @@ Usage: flog [options]
 Version: %s
 
 Options:
-  -f, --format string      choose log format. ("apache_common"|"apache_combined"|"apache_error"|"rfc3164") (default "apache_common")
+  -f, --format string      choose log format. ("apache_common"|"apache_combined"|"apache_error"|"rfc3164"|"rfc5424") (default "apache_common")
   -o, --output string      output filename. Path-like is allowed. (default "generated.log")
   -t, --type string        log output type. ("stdout"|"log"|"gz") (default "stdout")
   -n, --number integer     number of lines to generate.
@@ -31,7 +31,7 @@ Options:
   -l, --loop               loop output forever until killed.
 `
 
-var validFormats = []string{"apache_common", "apache_combined", "apache_error", "rfc3164"}
+var validFormats = []string{"apache_common", "apache_combined", "apache_error", "rfc3164", "rfc5424"}
 var validTypes = []string{"stdout", "log", "gz"}
 
 // Option defines log generator options
diff --git a/time.go b/time.go
index 7bbc9f8..f751dad 100644
--- a/time.go
+++ b/time.go
@@ -3,4 +3,5 @@ package main
 // Custom predefined layouts
 const (
 	RFC3164 = "Jan 02 15:04:05"
+	RFC5424 = "2006-01-02T15:04:05.000Z"
 )