diff --git a/testground/README.md b/testground/README.md
index f4dc897498..40018edbb1 100644
--- a/testground/README.md
+++ b/testground/README.md
@@ -2,7 +2,7 @@
 
 ## Build Image
 
->  Prerequisites: nix, linux remote builder for macOS
+>  Prerequisites: nix, for macOS also need [linux remote builder](https://nix.dev/manual/nix/2.22/advanced-topics/distributed-builds.html)
 
 You can test with the prebuilt images in [github registry](https://github.com/crypto-org-chain/cronos/pkgs/container/cronos-testground), or build the image locally: