diff --git a/polkadot/README.md b/polkadot/README.md
index a3d57650f5..7679ebec59 100644
--- a/polkadot/README.md
+++ b/polkadot/README.md
@@ -200,7 +200,7 @@ cargo build # Builds all native code
 You can run the tests if you like:
 
 ```bash
-cargo test --all
+cargo test --all --release
 ```
 
 You can start a development chain with: