diff --git a/docs/setup.md b/docs/setup.md
index 915bbdd..7bc37ae 100644
--- a/docs/setup.md
+++ b/docs/setup.md
@@ -124,9 +124,12 @@ curl -fsSL https://get.docker.com | sh
 **Option B — Debian-packaged `docker.io` (older but simpler, no extra repo needed):**
 
 ```bash
-sudo apt install -y docker.io
+sudo apt install -y docker.io docker-compose
 ```
 
+> **Note:** `docker.io` ships with Compose v1 as a separate binary.
+> Use `docker-compose` (with a hyphen) instead of `docker compose` everywhere in this guide.
+
 Then, regardless of which option you used:
 
 ```bash