diff --git a/uniswap/constants.py b/uniswap/constants.py
index 0318697..436634b 100644
--- a/uniswap/constants.py
+++ b/uniswap/constants.py
@@ -6,6 +6,7 @@
     1: "mainnet",
     3: "ropsten",
     4: "rinkeby",
+    42: "kovan",
     56: "binance",
     97: "binance_testnet",
     137: "polygon",