diff --git a/spec.json b/spec.json
index c8a06586..301b55ab 100644
--- a/spec.json
+++ b/spec.json
@@ -40132,6 +40132,13 @@
               "segments_based_regions"
             ]
           },
+          {
+            "description": "Allows legacy sketches to be edited using point-and-click in Zoo Design Studio.",
+            "type": "string",
+            "enum": [
+              "legacy_sketch_mode"
+            ]
+          },
           {
             "description": "Enables sketch solve experimental features in Zoo Design Studio.",
             "type": "string",