diff --git a/commands/vectorWorldToModel.yml b/commands/vectorWorldToModel.yml
index 0eae9d1c2..f6b663b82 100644
--- a/commands/vectorWorldToModel.yml
+++ b/commands/vectorWorldToModel.yml
@@ -16,7 +16,7 @@ syntax:
     type: Object
   - name: worldDir
     description: vector direction in world space in format [x,y,z]
-    type: ArrayUnknown
+    type: Vector3d
 argument_loc: Unspecified
 effect_loc: Unspecified
 since: