diff --git a/features/run_control/modifier.feature b/features/run_control/modifier.feature
new file mode 100644
index 0000000..24da25c
--- /dev/null
+++ b/features/run_control/modifier.feature
@@ -0,0 +1,10 @@
+Feature: `modifier' run control keyword
+
+  Scenario: configures the modifier key
+    Given a run control file with:
+      """
+      modifier :ctrl
+      """
+    And uhwm is running
+    When I press the ctrl+q keys
+    Then uhwm must terminate successfully
diff --git a/lib/uh/wm/env.rb b/lib/uh/wm/env.rb
index ae30fe1..aa223c1 100644
--- a/lib/uh/wm/env.rb
+++ b/lib/uh/wm/env.rb
@@ -3,6 +3,8 @@ module Uh
     class Env
       RC_PATH = '~/.uhwmrc.rb'.freeze
 
+      MODIFIER = :mod1
+
       LOGGER_LEVEL          = Logger::WARN
       LOGGER_LEVEL_VERBOSE  = Logger::INFO
       LOGGER_LEVEL_DEBUG    = Logger::DEBUG
@@ -14,11 +16,12 @@ module Uh
       def_delegator :@output, :print
 
       attr_reader   :output, :keybinds
-      attr_accessor :verbose, :debug, :rc_path, :layout_class
+      attr_accessor :verbose, :debug, :rc_path, :layout_class, :modifier
 
       def initialize output
         @output   = output
         @rc_path  = RC_PATH
+        @modifier = MODIFIER
         @keybinds = {
           q: proc { quit }
         }
diff --git a/lib/uh/wm/manager.rb b/lib/uh/wm/manager.rb
index db043a6..9943a8d 100644
--- a/lib/uh/wm/manager.rb
+++ b/lib/uh/wm/manager.rb
@@ -3,10 +3,11 @@ module Uh
     class Manager
       INPUT_MASK = Events::SUBSTRUCTURE_REDIRECT_MASK
 
-      attr_reader :display
+      attr_reader :modifier, :display
 
-      def initialize events, display = Display.new
+      def initialize events, modifier, display = Display.new
         @events   = events
+        @modifier = modifier
         @display  = display
       end
 
@@ -22,7 +23,7 @@ module Uh
       end
 
       def grab_key keysym, mod = nil
-        mod_mask = KEY_MODIFIERS[:mod1]
+        mod_mask = KEY_MODIFIERS[@modifier]
         mod_mask |= KEY_MODIFIERS[mod] if mod
         @display.grab_key keysym.to_s, mod_mask
       end
diff --git a/lib/uh/wm/run_control.rb b/lib/uh/wm/run_control.rb
index 7c68a3d..2d511be 100644
--- a/lib/uh/wm/run_control.rb
+++ b/lib/uh/wm/run_control.rb
@@ -24,6 +24,10 @@ module Uh
         instance_eval code, path
       end
 
+      def modifier mod
+        @env.modifier = mod
+      end
+
       def key keysym, &block
         @env.keybinds[translate_keysym keysym] = block
       end
diff --git a/lib/uh/wm/runner.rb b/lib/uh/wm/runner.rb
index 8e3c921..5ee8d08 100644
--- a/lib/uh/wm/runner.rb
+++ b/lib/uh/wm/runner.rb
@@ -14,12 +14,12 @@ module Uh
       extend Forwardable
       def_delegator :@env, :layout
 
-      attr_reader :env, :events, :manager, :actions
+      attr_reader :env, :events, :actions
 
       def initialize env, manager: nil, stopped: false
         @env      = env
         @events   = Dispatcher.new
-        @manager  = manager || Manager.new(@events)
+        @manager  = manager
         @actions  = ActionsHandler.new(@env, @events)
         @stopped  = stopped
       end
@@ -32,6 +32,10 @@ module Uh
         @stopped = true
       end
 
+      def manager
+        @manager ||= Manager.new(@events, @env.modifier)
+      end
+
       def evaluate_run_control
         RunControl.evaluate(env)
       end
@@ -44,14 +48,14 @@ module Uh
       end
 
       def connect_manager
-        @manager.connect
+        manager.connect
         @env.keybinds.each do |keysym, _|
-          @manager.grab_key *keysym
+          manager.grab_key *keysym
         end
       end
 
       def run_until &block
-        @manager.handle_pending_events until block.call
+        manager.handle_pending_events until block.call
       end
 
 
diff --git a/spec/uh/wm/env_spec.rb b/spec/uh/wm/env_spec.rb
index c357980..1d157dd 100644
--- a/spec/uh/wm/env_spec.rb
+++ b/spec/uh/wm/env_spec.rb
@@ -21,6 +21,10 @@ module Uh
         expect(env.layout_class).not_to be
       end
 
+      it 'has the default modifier set' do
+        expect(env.modifier).to eq :mod1
+      end
+
       it 'has defaults key bindings set' do
         expect(env.keybinds.keys).to eq %i[q]
       end
diff --git a/spec/uh/wm/manager_spec.rb b/spec/uh/wm/manager_spec.rb
index 6ac3c03..3f6474f 100644
--- a/spec/uh/wm/manager_spec.rb
+++ b/spec/uh/wm/manager_spec.rb
@@ -2,8 +2,9 @@ module Uh
   module WM
     RSpec.describe Manager do
       let(:events)      { Dispatcher.new }
+      let(:modifier)    { :mod1 }
       let(:display)     { Display.new }
-      subject(:manager) { described_class.new events, display }
+      subject(:manager) { described_class.new events, modifier, display }
 
       it 'has a new display' do
         expect(manager.display).to be_a Display
@@ -47,7 +48,7 @@ module Uh
       describe '#grab_key' do
         it 'grabs given key on the display' do
           expect(manager.display)
-            .to receive(:grab_key).with('f', KEY_MODIFIERS[:mod1])
+            .to receive(:grab_key).with('f', KEY_MODIFIERS[modifier])
           manager.grab_key :f
         end
 
@@ -55,7 +56,7 @@ module Uh
           it 'grabs the key with given modifier' do
             expect(manager.display)
               .to receive(:grab_key)
-              .with('f', KEY_MODIFIERS[:mod1] | KEY_MODIFIERS[:shift])
+              .with('f', KEY_MODIFIERS[modifier] | KEY_MODIFIERS[:shift])
             manager.grab_key :f, :shift
           end
         end
@@ -91,7 +92,7 @@ module Uh
 
       describe '#handle' do
         context 'when key_press event is given' do
-          let(:mod_mask) { KEY_MODIFIERS[:mod1] }
+          let(:mod_mask) { KEY_MODIFIERS[modifier] }
           let(:event) do
             double 'event',
               type:           :key_press,
@@ -105,7 +106,7 @@ module Uh
           end
 
           context 'whith shift key modifier' do
-            let(:mod_mask) { KEY_MODIFIERS[:mod1] | KEY_MODIFIERS[:shift] }
+            let(:mod_mask) { KEY_MODIFIERS[modifier] | KEY_MODIFIERS[:shift] }
 
             it 'emits :key event with the corresponding key and :shift' do
               events.on(:key, :f, :shift) { throw :key_press_code }
diff --git a/spec/uh/wm/run_control_spec.rb b/spec/uh/wm/run_control_spec.rb
index 421ccc3..7684b8e 100644
--- a/spec/uh/wm/run_control_spec.rb
+++ b/spec/uh/wm/run_control_spec.rb
@@ -50,6 +50,13 @@ module Uh
         end
       end
 
+      describe '#modifier' do
+        it 'updates env modifier' do
+          rc.modifier :ctrl
+          expect(env.modifier).to eq :ctrl
+        end
+      end
+
       describe '#key' do
         let(:code) { -> { :keybind_code } }
 
diff --git a/spec/uh/wm/runner_spec.rb b/spec/uh/wm/runner_spec.rb
index 6b14780..2d605c1 100644
--- a/spec/uh/wm/runner_spec.rb
+++ b/spec/uh/wm/runner_spec.rb
@@ -21,10 +21,6 @@ module Uh
         expect(runner.events).to be_a Dispatcher
       end
 
-      it 'has a manager' do
-        expect(runner.manager).to be_a Manager
-      end
-
       it 'is not stopped' do
         expect(runner).not_to be_stopped
       end
@@ -53,6 +49,16 @@ module Uh
         end
       end
 
+      describe '#manager' do
+        it 'returns the manager' do
+          expect(runner.manager).to be_a Manager
+        end
+
+        it 'sets the manager modifier as env modifier' do
+          expect(runner.manager.modifier).to eq env.modifier
+        end
+      end
+
       describe '#evaluate_run_control' do
         it 'evaluates the run control file with RunControl and current env' do
           expect(RunControl).to receive(:evaluate).with env