diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..34200b7
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,24 @@
+---
+kind: pipeline
+name: default
+
+workspace:
+  base: /drone/diplonat
+
+steps: 
+- name: code style
+  image: rust:1.47
+  commands:
+  - rustup component add rustfmt
+  - cargo fmt --all -- --check
+# - name: code quality
+#   image: rust:1.47
+#   commands:
+#   - cargo clippy -- --deny warnings
+# - name: test
+#   image: rust:1.47
+#   commands:
+#   - cargo build --verbose --all
+#   - cargo test --verbose --all
+
+  
\ No newline at end of file
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..f8de6cc
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,34 @@
+# Contributing to Diplonat 
+
+## Development guidelines
+
+### Code formatting 
+
+[Our CI pipeline](./.drone.yml) features a verification of the code format, using [rustfmt](https://github.com/rust-lang/rustfmt).
+
+#### Installing rustfmt
+
+You can run `rustfmt` with Rust 1.24 and above.
+
+To install: 
+
+```
+rustup component add rustfmt
+```
+
+#### Usage 
+
+To run on Diplonat, launch the following in the root directory:
+
+```
+cargo fmt --all
+``` 
+
+This will format the whole repository using the settigs defined in [`.rustfmt.toml`](./.rustfmt.toml): soft tabs of 2 spaces.
+
+#### Auto-format code
+
+You can automate formatting in a number of ways:
+
+* [Setup your IDE to use `rustfmt`](https://github.com/rust-lang/rustfmt#running-rustfmt-from-your-editor).
+* Setup a git hook to run `rustfmt` before each commit.
diff --git a/README.md b/README.md
index 6f3b7f4..a82811b 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,10 @@ export RUST_LOG=debug
 cargo run
 ```
 
+## Contributing
+
+Refer to [CONTRIBUTING.md](./CONTRIBUTING.md).
+
 ## Design Guidelines
 
 Diplonat is made of a set of Components.
diff --git a/src/config/options_test.rs b/src/config/options_test.rs
index 0dfaaac..3d74d7d 100644
--- a/src/config/options_test.rs
+++ b/src/config/options_test.rs
@@ -44,13 +44,6 @@ fn all_valid_options() -> HashMap<String, String> {
   opts
 }
 
-// #[test]
-// #[should_panic]
-// fn err_empty_env() {
-// 	 std::env::remove_var("DIPLONAT_CONSUL_NODE_NAME");
-// 	 ConfigOpts::from_env().unwrap();
-// }
-
 #[test]
 #[should_panic]
 fn err_empty_env() {
diff --git a/src/fw.rs b/src/fw.rs
index e18a301..3cb4afb 100644
--- a/src/fw.rs
+++ b/src/fw.rs
@@ -97,3 +97,4 @@ pub fn cleanup(ipt: &iptables::IPTables) -> Result<()> {
 
   Ok(())
 }
+
diff --git a/src/fw_actor.rs b/src/fw_actor.rs
index d41a97f..c32ee5a 100644
--- a/src/fw_actor.rs
+++ b/src/fw_actor.rs
@@ -93,3 +93,4 @@ impl FirewallActor {
     return Ok(());
   }
 }
+