Update readme

README.md

@@ -8,10 +8,13 @@ The app lives in your menu bar and saves files to your downloads folder. It's th
 
 * **Receive only**. For now. I haven't yet figured out how to make Android turn on the MDNS service and/or show the "a device nearby is sharing" notification.
 * **Wi-Fi LAN only**. Your Android device and your Mac need to be on the same network for this app to work. Google's implementation supports multiple mediums, including Wi-Fi Direct, Wi-Fi hotspot, Bluetooth, some kind of 5G peer-to-peer connection, and even a WebRTC-based protocol that goes over the internet through Google servers. Wi-Fi direct isn't supported on macOS (Apple has their own, incompatible, AWDL thing, used in AirDrop). Bluetooth needs further reverse engineering.
+* **Visible to everyone on your network at all times** while the app is running. Limited visibility (contacts etc) requires talking to Google servers, and becoming temporarily visible requires listening for whatever triggers the "device nearby is sharing" notification.
 
 ## Installation
 
-Download the latest build from the releases section, unzip, move to your applications folder. Do the usual Gatekeeper thing to run an Apple-untrusted app for the first time. If you want the app to start on boot, add it manually to login objects in System Preferences.
+Download the latest build from the releases section, unzip, move to your applications folder. When running for the first time, right-click the app and select "Open", then confirm running an app from unidentified developer.
+
+If you want the app to start on boot, add it manually to login objects in System Preferences.
 
 ## FAQ