diff --git a/claude_bottle/cli/build.py b/claude_bottle/cli/build.py
index 492ffd7..88fe716 100644
--- a/claude_bottle/cli/build.py
+++ b/claude_bottle/cli/build.py
@@ -2,13 +2,17 @@
 
 from __future__ import annotations
 
+import argparse
 import os
 
 from .. import docker as docker_mod
-from ._common import REPO_DIR
+from ._common import PROG, REPO_DIR
 
 
-def cmd_build(_argv: list[str]) -> int:
+def cmd_build(argv: list[str]) -> int:
+    parser = argparse.ArgumentParser(prog=f"{PROG} build", add_help=True)
+    parser.parse_args(argv)
+
     docker_mod.require_docker()
     image = os.environ.get("CLAUDE_BOTTLE_IMAGE", "claude-bottle:latest")
     docker_mod.build_image(image, REPO_DIR)