diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3c3134ec21e375c4483a9c2cf8bce5f6065b6b53..7f2fc29bbb7e340cac366e9902cb07b5ddf9dd7c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -31,7 +31,9 @@ Please read [Developer documentation] before contribute.
 
 2. Ensure that you respect the [commit naming conventions].
 
-3. Ensure that all automated tests pass with the `npm test` command.
+3. Ensure that all automated tests pass with the `cargo test` command.
+
+3. Ensure that the code is well formated `cargo fmt` and comply with the good practices `cargo clippy`. If you have been working on tests, check everything with `cargo clippy --all --tests`.
 
 4. Update the documentation with details of changes to the interface, this includes new environment
     variables, exposed ports, useful file locations and container parameters.
diff --git a/end2end-tests/tests/common/cert.rs b/end2end-tests/tests/common/cert.rs
index 7a344e3191c6401676dd74c2532c1a75ec4e9059..021dfa2ea970f5b75bd89d618739255631be74f6 100644
--- a/end2end-tests/tests/common/cert.rs
+++ b/end2end-tests/tests/common/cert.rs
@@ -33,7 +33,7 @@ pub async fn certify(
         client,
         api.tx()
             .cert()
-            .add_cert(to.into())
+            .add_cert(to)
             .create_signed(&from, ())
             .await?,
     )