diff --git a/backend.go b/backend.go
index 98f7682..4efea54 100644
--- a/backend.go
+++ b/backend.go
@@ -13,8 +13,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/backend_portal.go b/backend_portal.go
index 1f1bc6f..3de18ef 100644
--- a/backend_portal.go
+++ b/backend_portal.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
@@ -35,6 +35,7 @@ const (
 	btnReleased uint32 = 0
 	btnPressed  uint32 = 1
 
+	// linux/input-event-codes.h
 	btnLeft   int32 = 0x110
 	btnRight  int32 = 0x111
 	btnMiddle int32 = 0x112
diff --git a/backend_portal_disabled.go b/backend_portal_disabled.go
index 499d5f5..05ca72f 100644
--- a/backend_portal_disabled.go
+++ b/backend_portal_disabled.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/backend_windows.go b/backend_windows.go
index 2b25cc7..78574e0 100644
--- a/backend_windows.go
+++ b/backend_windows.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/backend_windows_disabled.go b/backend_windows_disabled.go
index 5d902ea..b0051b0 100644
--- a/backend_windows_disabled.go
+++ b/backend_windows_disabled.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/backend_x11.go b/backend_x11.go
index 6749408..ad3445b 100644
--- a/backend_x11.go
+++ b/backend_x11.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/backend_x11_disabled.go b/backend_x11_disabled.go
index 8a68e22..11a8234 100644
--- a/backend_x11_disabled.go
+++ b/backend_x11_disabled.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/flatpak/com.github.unrud.RemoteTouchpad.yaml b/flatpak/com.github.unrud.RemoteTouchpad.yaml
index 9839211..ad9276c 100644
--- a/flatpak/com.github.unrud.RemoteTouchpad.yaml
+++ b/flatpak/com.github.unrud.RemoteTouchpad.yaml
@@ -34,8 +34,7 @@ modules:
         dest: src/github.com/unrud/remote-touchpad
     buildsystem: simple
     build-commands:
-      - . /usr/lib/sdk/golang/enable.sh; env GOPATH="$(pwd)" go build -tags 'portal x11'
-        github.com/unrud/remote-touchpad
+      - . /usr/lib/sdk/golang/enable.sh; env GOPATH="$(pwd)" go build -tags 'portal x11' github.com/unrud/remote-touchpad
       - install -Dm0755 -t /app/bin remote-touchpad
       - install -Dm0755 -t /app/bin src/github.com/unrud/remote-touchpad/desktop/remote-touchpad-wait-on-error
       - install -Dm0644 -t /app/share/metainfo src/github.com/unrud/remote-touchpad/desktop/com.github.unrud.RemoteTouchpad.appdata.xml
diff --git a/host.go b/host.go
index 2e622a8..14ed821 100644
--- a/host.go
+++ b/host.go
@@ -13,8 +13,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/keysyms.generator.go b/keysyms.generator.go
index 17340be..74d479d 100644
--- a/keysyms.generator.go
+++ b/keysyms.generator.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/keysyms.go b/keysyms.go
index a81dfd9..dbafa70 100644
--- a/keysyms.go
+++ b/keysyms.go
@@ -13,8 +13,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
@@ -26,12 +26,13 @@ import "errors"
 type Keysym int32
 
 const (
-	xf86AudioLowerVolume Keysym = 0x1008ff11
-	xf86AudioMute        Keysym = 0x1008ff12
-	xf86AudioRaiseVolume Keysym = 0x1008ff13
-	xf86AudioPlay        Keysym = 0x1008ff14
-	xf86AudioPrev        Keysym = 0x1008ff16
-	xf86AudioNext        Keysym = 0x1008ff17
+	// X11/XF86keysym.h
+	xf86xkAudioLowerVolume Keysym = 0x1008ff11
+	xf86xkAudioMute        Keysym = 0x1008ff12
+	xf86xkAudioRaiseVolume Keysym = 0x1008ff13
+	xf86xkAudioPlay        Keysym = 0x1008ff14
+	xf86xkAudioPrev        Keysym = 0x1008ff16
+	xf86xkAudioNext        Keysym = 0x1008ff17
 )
 
 func RuneToKeysym(runeValue rune) (Keysym, error) {
@@ -51,22 +52,22 @@ func RuneToKeysym(runeValue rune) (Keysym, error) {
 
 func KeyToKeysym(key Key) (Keysym, error) {
 	if key == KeyVolumeMute {
-		return xf86AudioMute, nil
+		return xf86xkAudioMute, nil
 	}
 	if key == KeyVolumeDown {
-		return xf86AudioLowerVolume, nil
+		return xf86xkAudioLowerVolume, nil
 	}
 	if key == KeyVolumeUp {
-		return xf86AudioRaiseVolume, nil
+		return xf86xkAudioRaiseVolume, nil
 	}
 	if key == KeyMediaPlayPause {
-		return xf86AudioPlay, nil
+		return xf86xkAudioPlay, nil
 	}
 	if key == KeyMediaPrevTrack {
-		return xf86AudioPrev, nil
+		return xf86xkAudioPrev, nil
 	}
 	if key == KeyMediaNextTrack {
-		return xf86AudioNext, nil
+		return xf86xkAudioNext, nil
 	}
 	return 0, errors.New("key not mapped to keysym")
 }
diff --git a/main.go b/main.go
index 5475122..4b9d967 100644
--- a/main.go
+++ b/main.go
@@ -13,8 +13,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/qr.go b/qr.go
index 3c94b84..aae21db 100644
--- a/qr.go
+++ b/qr.go
@@ -13,8 +13,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/terminal.go b/terminal.go
index 86e559c..91de022 100644
--- a/terminal.go
+++ b/terminal.go
@@ -13,8 +13,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/terminal_posix.go b/terminal_posix.go
index 1e5ad90..e79ea61 100644
--- a/terminal_posix.go
+++ b/terminal_posix.go
@@ -15,8 +15,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/terminal_windows.go b/terminal_windows.go
index 22c0c3e..5637a7d 100644
--- a/terminal_windows.go
+++ b/terminal_windows.go
@@ -13,8 +13,8 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package main
diff --git a/webdata/fn.js b/webdata/fn.js
index 8c4fa6d..9a018b2 100644
--- a/webdata/fn.js
+++ b/webdata/fn.js
@@ -13,14 +13,15 @@
  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *    GNU General Public License for more details.
  *
- *   You should have received a copy of the GNU General Public License
- *   along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-// [1 Touch, 2 Touches, 3 Touches]
+// [1 Touch, 2 Touches, 3 Touches] (as pixel)
 const TOUCH_MOVE_THRESHOLD = [10, 15, 15];
+// Max time between consecutive touches for clicking or dragging (as milliseconds)
 const TOUCH_TIMEOUT = 250;
-// [[px/s, mult], ...]
+// [[pixel/second, multiplicator], ...]
 const POINTER_ACCELERATION = [
     [0, 0],
     [87, 1],
@@ -311,7 +312,7 @@ window.addEventListener("load", function() {
     let text = document.getElementById("text");
 
     function showScene(scene) {
-        [opening, closed, pad, keys, keyboard].forEach(function (e) {
+        [opening, closed, pad, keys, keyboard].forEach(function(e) {
             e.classList.toggle("hidden", e != scene);
         });
     }
@@ -336,13 +337,10 @@ window.addEventListener("load", function() {
     text.value = "";
     showScene(opening);
 
-    let wsProtocol = "wss:";
-    if (location.protocol == "http:") {
-        wsProtocol = "ws:";
-    }
-    ws = new WebSocket(wsProtocol + "//" + location.hostname +
-        (location.port ? ":" + location.port : "") +
-        "/ws");
+    ws = new WebSocket(
+        (location.protocol == "http:" ? "ws:" : "wss:") + "//" + location.hostname +
+        (location.port ? ":" + location.port : "") + "/ws"
+    );
 
     ws.onmessage = function(evt) {
         if (authenticated) {
@@ -383,23 +381,21 @@ window.addEventListener("load", function() {
      {id: "volumedownbutton", key: KEY_VOLUME_DOWN},
      {id: "volumemutebutton", key: KEY_VOLUME_MUTE},
      {id: "volumeupbutton", key: KEY_VOLUME_UP}].forEach(function(o) {
-        document.getElementById(o.id).addEventListener("click",
-            function() {
-                ws.send("k" + o.key);
-            });
-     });
-    document.getElementById("sendbutton").addEventListener("click",
-        function() {
-            if (text.value != "") {
-                ws.send("t" + text.value);
-                text.value = "";
-            }
-            window.history.back();
+        document.getElementById(o.id).addEventListener("click", function() {
+            ws.send("k" + o.key);
         });
+    });
+    document.getElementById("sendbutton").addEventListener("click", function() {
+        if (text.value != "") {
+            ws.send("t" + text.value);
+            text.value = "";
+        }
+        window.history.back();
+    });
     window.onpopstate = function() {
         if (!pad.classList.contains("hidden") ||
-                !keyboard.classList.contains("hidden") ||
-                !keys.classList.contains("hidden")) {
+            !keyboard.classList.contains("hidden") ||
+            !keys.classList.contains("hidden")) {
             if (history.state == "keys") {
                 showKeys();
             } else if (history.state == "keyboard") {
@@ -409,10 +405,9 @@ window.addEventListener("load", function() {
             }
         }
     };
-    document.getElementById("reloadbutton").addEventListener("click",
-        function() {
-            location.reload();
-        });
+    document.getElementById("reloadbutton").addEventListener("click", function() {
+        location.reload();
+    });
     pad.addEventListener("touchstart", handleStart);
     pad.addEventListener("touchend", handleEnd);
     pad.addEventListener("touchcancel", handleEnd);