diff --git a/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json b/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json
index c0663452d..627f79b8c 100644
--- a/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json
+++ b/specification/0.0/schema/vrm.secondaryanimation.collidergroup.schema.json
@@ -13,7 +13,7 @@
                 "type": "object",
                 "properties": {
                     "offset": {
-                        "description": "The local coordinate from the node of the collider group.",
+                        "description": "The local coordinate from the node of the collider group in *left-handed* Y-up coordinate.",
                         "type": "object",
                         "properties": {
                             "x": {