diff --git a/README.md b/README.md
new file mode 100644
index 0000000..447dc11
--- /dev/null
+++ b/README.md
@@ -0,0 +1,23 @@
+# RandRoll
+
+None of the existing display configuration tools does what I think is "the right thing".
+So I went and wrote one.
+
+## The Right Thing
+
+* Don't start from a stored config, use xrandr to read the systems' current state
+* Allow creating "profiles" that will get applied smartly (not there yet)
+* Generate a xrandr invocation to reflect the desired configuration
+* Allow per-monitor scaling
+* Allow arbitrary monitor positioning
+* Implement "scale everything so all the pixels are the same size" (not done yet)
+
+## To try:
+
+If you have PySide2: `python main.py` in the folder where main.py is located.
+
+## TODO:
+
+* Implement other things
+* Make it a proper app, with installation and whatnot
+* Forget about it forever
diff --git a/main.py b/main.py
index 574a68d..9af0c12 100644
--- a/main.py
+++ b/main.py
@@ -1,8 +1,9 @@
 from copy import deepcopy
+import shlex
 import subprocess
 import sys
 
-from PySide2.QtCore import QFile, QObject, Slot
+from PySide2.QtCore import QFile, QObject
 from PySide2.QtUiTools import QUiLoader
 from PySide2.QtWidgets import QApplication, QGraphicsScene
 
@@ -11,19 +12,20 @@ from monitor_item import MonitorItem
 
 def gen_xrandr_from_data(data):
     """Takes monitor data and generates a xrandr command line."""
-    cli = ['xrandr']
+    cli = ["xrandr"]
     for name, mon in data.items():
-        cli.append(f'--output {name}')
+        cli.append(f"--output {name}")
         cli.append(f'--pos {int(mon["pos_x"])}x{int(mon["pos_y"])}')
         cli.append(f'--mode {mon["current_mode"]}')
-        mod_x, mod_y = [int(n) for n in mon['current_mode'].split('x')]
+        mod_x, mod_y = [int(n) for n in mon["current_mode"].split("x")]
         cli.append(f'--scale {mon["res_x"]/mod_x}x{mon["res_y"]/mod_y}')
-        if mon['primary']:
-            cli.append('--primary')
-        if not mon['enabled']:
-            cli.append('--off')
+        if mon["primary"]:
+            cli.append("--primary")
+        if not mon["enabled"]:
+            cli.append("--off")
+
+    return " ".join(cli)
 
-    return ' '.join(cli)
 
 def parse_monitor(line):
     parts = line.split()
@@ -68,6 +70,7 @@ class Window(QObject):
         super().__init__()
         self.ui = ui
         ui.show()
+        self.ui.setWindowTitle('Display Configuration')
         self.ui.screenCombo.currentTextChanged.connect(self.monitor_selected)
         self.xrandr_info = {}
         self.get_xrandr_info()
@@ -92,7 +95,7 @@ class Window(QObject):
 
     def do_apply(self):
         cli = gen_xrandr_from_data(self.xrandr_info)
-        print(cli)
+        subprocess.check_call(shlex.split(cli))
 
     def fill_ui(self):
         """Load data from xrandr and setup the whole thing."""
@@ -114,13 +117,17 @@ class Window(QObject):
         mode = self.ui.modes.currentText()
         if not mode:
             return
-        print(f'Changing {mon} to {mode}')
-        self.xrandr_info[mon]['current_mode'] = mode
-        mode_x, mode_y = mode.split('x')
+        print(f"Changing {mon} to {mode}")
+        self.xrandr_info[mon]["current_mode"] = mode
+        mode_x, mode_y = mode.split("x")
         # use resolution via scaling
-        self.xrandr_info[mon]['res_x'] = int(int(mode_x) * self.ui.horizontalScale.value() / 100)
-        self.xrandr_info[mon]['res_y'] = int(int(mode_y) * self.ui.verticalScale.value() / 100)
-        self.xrandr_info[mon]['item'].update_visuals(self.xrandr_info[mon])
+        self.xrandr_info[mon]["res_x"] = int(
+            int(mode_x) * self.ui.horizontalScale.value() / 100
+        )
+        self.xrandr_info[mon]["res_y"] = int(
+            int(mode_y) * self.ui.verticalScale.value() / 100
+        )
+        self.xrandr_info[mon]["item"].update_visuals(self.xrandr_info[mon])
 
     def monitor_moved(self):
         "Update xrandr_info with new monitor positions"
@@ -221,7 +228,6 @@ class Window(QObject):
         self.mode_changed()  # Not really, but it's the same thing
 
 
-
 if __name__ == "__main__":
     app = QApplication(sys.argv)
 
diff --git a/main.ui b/main.ui
index 8f632af..ede72c5 100644
--- a/main.ui
+++ b/main.ui
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>Dialog</class>
- <widget class="QDialog" name="Dialog">
+ <class>Main</class>
+ <widget class="QDialog" name="Main">
   <property name="geometry">
    <rect>
     <x>0</x>
@@ -169,6 +169,9 @@
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
       <widget class="QPushButton" name="resetButton">
+       <property name="toolTip">
+        <string>Reset to initial configuration</string>
+       </property>
        <property name="text">
         <string>Reset</string>
        </property>
@@ -189,6 +192,9 @@
      </item>
      <item>
       <widget class="QPushButton" name="okButton">
+       <property name="toolTip">
+        <string>Apply configuration and close</string>
+       </property>
        <property name="text">
         <string>Ok</string>
        </property>
@@ -196,6 +202,9 @@
      </item>
      <item>
       <widget class="QPushButton" name="applyButton">
+       <property name="toolTip">
+        <string>Apply configuration</string>
+       </property>
        <property name="text">
         <string>Apply</string>
        </property>
@@ -203,6 +212,9 @@
      </item>
      <item>
       <widget class="QPushButton" name="cancelButton">
+       <property name="toolTip">
+        <string>Close without applying configuration</string>
+       </property>
        <property name="text">
         <string>Cancel</string>
        </property>