diff --git a/src/Jackett.Common/Definitions/linuxtracker.yml b/src/Jackett.Common/Definitions/linuxtracker.yml
index 360d6e336..faee3a20a 100644
--- a/src/Jackett.Common/Definitions/linuxtracker.yml
+++ b/src/Jackett.Common/Definitions/linuxtracker.yml
@@ -293,6 +293,8 @@ caps:
     - {id: 2160, cat: PC/ISO, desc: "Zeroshell"}
     - {id: 2193, cat: PC/ISO, desc: "Zevenet"}
     - {id: 1233, cat: PC/ISO, desc: "Zorin"}
+    # undocumented categories
+    - {id: 531, cat: PC/ISO, desc: "Super Grub2 Disk"}
 
   modes:
     search: [q]