diff --git a/car-rs/Cargo.toml b/car-rs/Cargo.toml
index aacd978..ecc0a23 100644
--- a/car-rs/Cargo.toml
+++ b/car-rs/Cargo.toml
@@ -9,6 +9,8 @@ edition = "2021"
 # https://github.com/golemparts/rppal
 rppal = "0.13.1"
 tokio = { version = "1", features = ["full"] }
+
+# https://github.com/hyperium/tonic
 tonic = "0.8.0"
 
 [build]