diff --git a/commands/setHitIndex.yml b/commands/setHitIndex.yml
index 7cbb4d6cb..47c24c1c3 100644
--- a/commands/setHitIndex.yml
+++ b/commands/setHitIndex.yml
@@ -22,7 +22,8 @@ syntax:
     description: hit part index of the Hit Point
     type: Number
   - name: damage
-    type: Unknown
+    description: level of damage, 0 = no damage, 1 = full damage
+    type: Number
   - name: useEffects
     description: '[[false]] to skip destruction effects'
     type: Boolean