diff --git a/uniswap/constants.py b/uniswap/constants.py
index d7a7ee4..0318697 100644
--- a/uniswap/constants.py
+++ b/uniswap/constants.py
@@ -8,6 +8,7 @@
     4: "rinkeby",
     56: "binance",
     97: "binance_testnet",
+    137: "polygon",
     100: "xdai",
 }