diff --git a/contrib/devtools/chainparams/README.md b/contrib/devtools/chainparams/README.md
--- a/contrib/devtools/chainparams/README.md
+++ b/contrib/devtools/chainparams/README.md
@@ -17,7 +17,7 @@
 ## Testnet
 ```
 bitcoind --testnet
-make_chainparams --testnet -a 127.0.0.1:18332 > chainparams_test.txt
+make_chainparams -a 127.0.0.1:18332 > chainparams_test.txt
 ```
 
 ## Build C++ Header File