diff --git a/docs/contributing.md b/docs/contributing.md
index 9c1948cf..c314a4da 100644
--- a/docs/contributing.md
+++ b/docs/contributing.md
@@ -17,6 +17,7 @@
     - pnpm
     - shellcheck
     - sea-orm-cli
+    - cargo
 
 2. コンテナを起動し、PGroonga を有効化する