diff --git a/db/orm-defs.d.ts b/db/orm-defs.d.ts
index 622e1a0..3e68639 100644
--- a/db/orm-defs.d.ts
+++ b/db/orm-defs.d.ts
@@ -50,6 +50,7 @@ export type Models = {
 		channel_id: string
 	}
 
+	// A sim is an account that is being simulated by the bridge to copy events from the other side. See d2m\actions\register-user.js for relevant behavior and comments.
 	sim: {
 		user_id: string
 		sim_name: string