diff --git a/src/polymarket/models/perps/market.py b/src/polymarket/models/perps/market.py
index 1a46ca33..0564a643 100644
--- a/src/polymarket/models/perps/market.py
+++ b/src/polymarket/models/perps/market.py
@@ -45,6 +45,7 @@ class PerpsInstrument(BaseModel):
     max_market_notional: _Decimal
     max_limit_notional: _Decimal
     max_leverage: int
+    isolated_only: bool
     risk_tiers: tuple[PerpsRiskTier, ...]