diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index cb13024..a0c6d81 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -26,6 +26,7 @@ This is a Rust project, so [rustup](https://rustup.rs/) is the best place to sta
 This is a pure rust project, so only `cargo` is needed.
 
 - `cargo check` to analyze the current package and report errors.
+- `cargo fmt` to format the current code.
 - `cargo build` to compile the current package.
 - `cargo clippy` to catch common mistakes and improve code.
 - `cargo test` to run unit tests.