diff --git a/schema/tables/alf.yml b/schema/tables/alf.yml
index 4a610c3c52..a7bae37b7a 100644
--- a/schema/tables/alf.yml
+++ b/schema/tables/alf.yml
@@ -1,4 +1,5 @@
 name: alf
+description: Details about the status of the built-in firewall protection on this Mac.
 examples: >-
   See the state of the Application Layer Firewall on a Mac. A result of 0 means
   it is disabled, 1 means it is enabled, and 2 means it is enabled and blocking
@@ -10,3 +11,5 @@ examples: >-
   SELECT global_state FROM alf;
 
   ```
+notes: >-
+  - This table provides information about the built-in firewall in macOS, also known as [Application Layer Firewall (ALF)](https://support.apple.com/guide/mac-help/block-connections-to-your-mac-with-a-firewall-mh34041/mac)