diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 271dface..32646ebb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -31,7 +31,7 @@ tests for you.
 
 ```sh
 # Test all the example code in Serde documentation
-cargo test
+cargo test --features derive
 ```
 
 ##### In the [`test_suite/deps`] directory