diff --git a/src/discordcr/mappings/channel.cr b/src/discordcr/mappings/channel.cr
index 22064cd0..871fe83a 100644
--- a/src/discordcr/mappings/channel.cr
+++ b/src/discordcr/mappings/channel.cr
@@ -42,6 +42,7 @@ module Discord
     property reactions : Array(Reaction)?
     property nonce : String | Int64?
     property activity : Activity?
+    property webhook_id : Snowflake?
   end
 
   enum ActivityType : UInt8