diff --git a/inactive-windows-transparency.py b/inactive-windows-transparency.py
old mode 100755
new mode 100644
index bf98917..c0f58f2
--- a/inactive-windows-transparency.py
+++ b/inactive-windows-transparency.py
@@ -13,7 +13,7 @@
 import i3ipc
 
 
-def on_window_focus(inactive_opacity, ipc, event):
+def on_window_focus(inactive_opacity, exception, ipc, event):
     global prev_focused
     global prev_workspace
 
@@ -23,14 +23,18 @@ def on_window_focus(inactive_opacity, ipc, event):
         return
 
     focused = event.container
-    workspace = focused_workspace.workspace().num
 
     if focused.id != prev_focused.id:  # https://github.com/swaywm/sway/issues/2859
-        focused.command("opacity 1")
-        if workspace == prev_workspace:
+        if exception not in focused.marks: 
+            focused.command("opacity 1")
+        if exception not in prev_focused.marks:
             prev_focused.command("opacity " + inactive_opacity)
         prev_focused = focused
-        prev_workspace = workspace
+
+def on_window_mark(ipc, event):
+    global prev_focused
+    focused = event.container
+    prev_focused = focused
 
 
 def remove_opacity(ipc):
@@ -43,6 +47,7 @@ def remove_opacity(ipc):
 
 if __name__ == "__main__":
     transparency_val = "0.80"
+    exception_mark = "^"
 
     parser = argparse.ArgumentParser(
         description="This script allows you to set the transparency of unfocused windows in sway."
@@ -54,6 +59,13 @@ def remove_opacity(ipc):
         default=transparency_val,
         help="set opacity value in range 0...1",
     )
+    parser.add_argument(
+        "--exception",
+        "-e",
+        type=str,
+        default=exception_mark,
+        help="set window mark that skip opacity",
+    )
     args = parser.parse_args()
 
     ipc = i3ipc.Connection()
@@ -63,9 +75,10 @@ def remove_opacity(ipc):
     for window in ipc.get_tree():
         if window.focused:
             prev_focused = window
-        else:
+        elif args.exception not in window.marks:
             window.command("opacity " + args.opacity)
     for sig in [signal.SIGINT, signal.SIGTERM]:
         signal.signal(sig, lambda signal, frame: remove_opacity(ipc))
-    ipc.on("window::focus", partial(on_window_focus, args.opacity))
-    ipc.main()
\ No newline at end of file
+    ipc.on("window::focus", partial(on_window_focus, args.opacity, args.exception))
+    ipc.on("window::mark", on_window_mark)
+    ipc.main()