diff --git a/doc/zoom.txt b/doc/zoom.txt
index 143458c..171cead 100644
--- a/doc/zoom.txt
+++ b/doc/zoom.txt
@@ -1,2 +1,9 @@
+# Zoom ratio for 4k monitor
 alias zoom='export QT_DEVICE_PIXEL_RATIO=2; /usr/bin/zoom'
 
+# Enable open zoom from browser
+xdg-mime default Zoom.desktop x-scheme-handler/zoommtg
+
+# verify
+xdg-mime query default x-scheme-handler/zoommtg
+