diff --git a/utils_v2/trading/zerodha_kite/models/auth_tokens.py b/utils_v2/trading/zerodha_kite/models/auth_tokens.py
index a22ae1a..216b609 100644
--- a/utils_v2/trading/zerodha_kite/models/auth_tokens.py
+++ b/utils_v2/trading/zerodha_kite/models/auth_tokens.py
@@ -92,6 +92,12 @@ class ZerodhaKiteAuthTokens(BaseModel):
         examples = ["individual/ind_with_nom"]
     )
 
+    userId: str = Field(
+        description = "the id of the user as assigned by zerodha",
+        alias = "user_id",
+        examples = ["ABC123"]
+    )
+
     email: str | None = Field(
         description = "the email id of the user",
         default = None,