diff --git a/content/posts/macos/macOS Security Overview.md b/content/posts/macos/macOS Security Overview.md
index aa8c5a1..81e2b70 100644
--- a/content/posts/macos/macOS Security Overview.md	
+++ b/content/posts/macos/macOS Security Overview.md	
@@ -157,6 +157,8 @@ Be careful installing apps that require Administrator privileges to run, you're
 
 macOS comes with a built-in [firewall](https://support.apple.com/guide/mac-help/change-firewall-settings-on-mac-mh11783/mac). Make sure it's enabled at the very least, but you can block all incoming connections for the best security/privacy.
 
+Avoid third-party firewalls like LittleSnitch or LuLu that require you to install a system extension. They don't cover DNS so data exfiltration is still possible.
+
 ## Disable AirDrop and Handoff
 
 You can disable [AirDrop and Handoff](https://support.apple.com/guide/mac-help/change-airdrop-handoff-settings-mchl6a407f99/mac) to better protect yourself against nearby threats. Turn off "Allow Handoff between this Mac and your iCloud devices," change "Airdrop" to "No one," turn off "AirPlay Receiver," and turn on "Require password."