diff --git a/README.md b/README.md
index f5edeea..68b015d 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ Service Shark is:
 - easy to use
 - lightweight (~2 MB)
 - has zero runtime dependencies (no .NET Framework, Java, ...)
+- [12factor/config](https://12factor.net/config) support
 - written in [golang](https://golang.org/)
 
 Service Shark is not:
@@ -26,11 +27,6 @@ Service Shark is not:
 https://github.com/matthiasng/service-shark/releases/latest
 ```
 
-#### Scoop
-```
-#todo setup scoop bucket + goreleaser
-```
-
 ### Compiling from source
 ```
 git clone https://github.com/matthiasng/service-shark.git
@@ -40,4 +36,25 @@ go build -o service-shark.exe main.go
 
 ## Usage
 
-#todo
+```
+  -cmd string
+        Command [required]
+  -logdir string
+        Log directory.
+        File name: {name}_YYYY-MM-DD_HH-MM-SS (default "./log")
+  -name string
+        Service name [required]
+  -workdir string
+        Working directory [required]
+  -- (terminator)
+        Pass all arguments after the terminator "--" to command.
+        Bind argument to environment variable with "env:{VAR_NAME}".
+```
+
+Exampe
+```
+service-shark.exe -name MyService -workdir C:/MyService -cmd java -- -jar MyProg.jar -Xmx1G -myArg "env:TEST_VALUE"
+```
+Service Shark will run ``java`` with ``-jar MyProg.jar -Xmx1G -myArg "123"`` from ``C:/MyService``.
+
+See [example/test-example-service.ps1](./example/test-example-service.ps1) for a complate example.
diff --git a/command/host.go b/command/host.go
index 9a68f33..63ff1b4 100644
--- a/command/host.go
+++ b/command/host.go
@@ -26,7 +26,7 @@ func (h *Host) init(env service.Environment) error {
 			return err
 		}
 
-		logFileName := fmt.Sprintf("%s_%s.log", h.Name(), time.Now().Format("02-01-2006_15-04-05"))
+		logFileName := fmt.Sprintf("%s_%s.log", h.Name(), time.Now().Format("2006-01-02-_15-04-05"))
 		logFilePath := path.Join(h.Arguments.LogDirectory, logFileName)
 
 		logFile, err := os.Create(logFilePath)
diff --git a/main.go b/main.go
index b7f4d3a..fae2978 100644
--- a/main.go
+++ b/main.go
@@ -15,14 +15,22 @@ var arguments = cli.Arguments{}
 
 func init() {
 	flag.CommandLine.Usage = func() {
-		fmt.Println("Usage of Service Shark:")
+		fmt.Println("Service Shark:")
+		fmt.Println("  Host any executable as a Windows service.")
+		fmt.Println("Usage:")
 		flag.PrintDefaults()
+		fmt.Println("  -- (terminator)")
+		fmt.Println(`	Pass all arguments after the terminator "--" to command.`)
+		fmt.Println(`	Bind argument to environment variable with "env:{VAR_NAME}".`)
+		fmt.Println("Example:")
+		fmt.Println(`  service-shark.exe ... -cmd java -- -jar test.jar -Xmx1G -myArg "env:MY_VALUE"`)
+		fmt.Println(`  => java -jar test.jar -Xmx1G -myArg "my env value"`)
 	}
 
 	flag.StringVar(&arguments.Name, "name", "", "Service name [required]")
 	flag.StringVar(&arguments.WorkingDirectory, "workdir", "", "Working directory [required]")
-	flag.StringVar(&arguments.LogDirectory, "logdir", "./log", "Log directory. Absolute path or relative to working directory.")
-	flag.StringVar(&arguments.Command, "cmd", "", "Command [required]")
+	flag.StringVar(&arguments.LogDirectory, "logdir", "./log", "Log directory.\nFile name: {name}_YYYY-MM-DD_HH-MM-SS")
+	flag.StringVar(&arguments.Command, "cmd", "", `Command [required]`)
 
 	flag.Parse()
 }