diff --git a/doc/grobi.conf b/doc/grobi.conf
index ff700cc..c751edb 100644
--- a/doc/grobi.conf
+++ b/doc/grobi.conf
@@ -98,6 +98,25 @@ rules:
     execute_after:
       - xautolock -disable
 
+    # Setup mirror
+    # Set DP-2 (External) as primary
+    # And mirror on the laptop
+  - name: Mirror
+    outputs_connected: [eDP-1, DP-2]
+    outputs_present: [eDP-1, DP-2]
+
+    configure_row:
+      - DP-2
+
+    configure_mirror: [DP-2, eDP-1]
+    primary: DP-2
+
+    # Additional commands can be specified per rule, in this case we make sure
+    # that xautolock is enabled and locks the screen after a while.
+    execute_after:
+      - xautolock -enable
+
+
   # If none of the rules above match, it's a good idea to have a fallback rule
   # which enables an output device that is always present, so you can debug
   # what's going on.
diff --git a/randr.go b/randr.go
index b6de378..8398dd2 100644
--- a/randr.go
+++ b/randr.go
@@ -498,6 +498,8 @@ func BuildCommandOutputRow(rule Rule, current Outputs) ([]*exec.Cmd, error) {
 		outputs = []string{rule.ConfigureSingle}
 	case len(rule.ConfigureRow) > 0:
 		outputs = rule.ConfigureRow
+	case len(rule.ConfigureMirror) == 1:
+		return nil, errors.New("mirror must have 2 or more displays")
 	default:
 		return nil, errors.New("empty monitor row configuration")
 	}
@@ -507,6 +509,11 @@ func BuildCommandOutputRow(rule Rule, current Outputs) ([]*exec.Cmd, error) {
 	command := "xrandr"
 	enableOutputArgs := [][]string{}
 
+	mirrornames := make(map[string]struct{})
+	for _, name := range rule.ConfigureMirror {
+		mirrornames[name] = struct{}{}
+	}
+
 	active := make(map[string]struct{})
 	var lastOutput = ""
 	for i, output := range outputs {
@@ -552,10 +559,13 @@ func BuildCommandOutputRow(rule Rule, current Outputs) ([]*exec.Cmd, error) {
 	}
 
 	disableOutputArgs := [][]string{}
-
 	// honour disable_order if present
 	for _, name := range rule.DisableOrder {
 		if _, ok := disableOutputs[name]; ok {
+			// Do not disable a mirrored output
+			if _, mirrored := mirrornames[name]; mirrored {
+				continue
+			}
 			args := []string{"--output", name, "--off"}
 			disableOutputArgs = append(disableOutputArgs, args)
 
@@ -565,10 +575,24 @@ func BuildCommandOutputRow(rule Rule, current Outputs) ([]*exec.Cmd, error) {
 
 	// collect remaining outputs to be disabled
 	for name := range disableOutputs {
+		// Do not disable a mirrored output
+		if _, mirrored := mirrornames[name]; mirrored {
+			continue
+		}
 		args := []string{"--output", name, "--off"}
 		disableOutputArgs = append(disableOutputArgs, args)
 	}
 
+	mirrorOutputArgs := [][]string{}
+	if len(rule.ConfigureMirror) > 1 {
+		m := rule.ConfigureMirror[0]
+		for _, name := range rule.ConfigureMirror[1:] {
+			mirrorOutputArgs = append(mirrorOutputArgs,
+				[]string{"--output", name, "--auto", "--same-as", m},
+			)
+		}
+	}
+
 	// enable/disable all monitors in one call to xrandr
 	if rule.Atomic {
 		V("using one atomic call to xrandr\n")
@@ -579,6 +603,9 @@ func BuildCommandOutputRow(rule Rule, current Outputs) ([]*exec.Cmd, error) {
 		for _, enableArgs := range enableOutputArgs {
 			args = append(args, enableArgs...)
 		}
+		for _, mirrorArgs := range mirrorOutputArgs {
+			args = append(args, mirrorArgs...)
+		}
 		cmd := exec.Command(command, args...)
 		return []*exec.Cmd{cmd}, nil
 	}
@@ -609,6 +636,12 @@ func BuildCommandOutputRow(rule Rule, current Outputs) ([]*exec.Cmd, error) {
 		cmds = append(cmds, exec.Command(command, args...))
 	}
 
+	if len(mirrorOutputArgs) > 0 {
+		args := []string{}
+		args = append(args, mirrorOutputArgs[0]...)
+		cmds = append(cmds, exec.Command(command, args...))
+	}
+
 	return cmds, nil
 }
 
diff --git a/rule.go b/rule.go
index 5a235f7..fe8b357 100644
--- a/rule.go
+++ b/rule.go
@@ -11,6 +11,7 @@ type Rule struct {
 
 	ConfigureRow     []string `yaml:"configure_row"`
 	ConfigureSingle  string   `yaml:"configure_single"`
+	ConfigureMirror  []string `yaml:"configure_mirror"`
 	ConfigureCommand string   `yaml:"configure_command"`
 
 	Primary string `yaml:"primary"`