diff --git a/cheat-sheets/Fortigate-debug-diagnose-complete-cheat-sheet.adoc b/cheat-sheets/Fortigate-debug-diagnose-complete-cheat-sheet.adoc
index f43b82f..4b347a2 100644
--- a/cheat-sheets/Fortigate-debug-diagnose-complete-cheat-sheet.adoc
+++ b/cheat-sheets/Fortigate-debug-diagnose-complete-cheat-sheet.adoc
@@ -168,6 +168,10 @@ thresholds `red` and `green`
 |Show contents of the flash memory holding FortiOS firmware images. One of the images
 will have `Active` set to `yes`, which means it is the used one.
 
+|*diagnose hardware deviceinfo disk*
+|Show all storage attached to the firewall, including disk type, volume, free
+space.
+
 |===