diff --git a/src/zona/cli.py b/src/zona/cli.py
index a211e1f..bbfc612 100644
--- a/src/zona/cli.py
+++ b/src/zona/cli.py
@@ -1,3 +1,4 @@
+from typing import Annotated
 import typer
 from pathlib import Path
 from zona import server
@@ -11,20 +12,67 @@ setup_logging("DEBUG")
 
 
 @app.command()
-def build(root: Path | None = None, output: Path | None = None):
+def build(
+    root: Annotated[
+        Path | None,
+        typer.Argument(
+            help="Directory containing config.yml",
+        ),
+    ] = None,
+    output: Annotated[
+        Path | None,
+        typer.Argument(help="Location to write built website"),
+    ] = None,
+):
+    """
+    Build the website.
+
+    Optionally specify the ROOT and OUTPUT directories.
+    """
     builder = ZonaBuilder(root, output)
     builder.build()
 
 
 @app.command()
-def serve(root: Path | None = None, output: Path | None = None):
+def serve(
+    root: Annotated[
+        Path | None,
+        typer.Argument(
+            help="Directory containing config.yml",
+        ),
+    ] = None,
+    output: Annotated[
+        Path | None,
+        typer.Argument(help="Location to write built website"),
+    ] = None,
+):
+    """
+    Build the website and start a live preview server.
+
+    The website is rebuilt when the source is modified.
+
+    Optionally specify the ROOT and OUTPUT directories.
+    """
     server.serve(root, output)
 
 
 @app.command()
-def init(root: Path | None = None):
-    # init will populate the current directory with
-    # the required folders and their default values
+def init(
+    root: Annotated[
+        Path | None,
+        typer.Argument(
+            help="Target directory to populate as a Zona project",
+        ),
+    ] = None,
+):
+    """
+    Initialize a Zona website project.
+
+    The required directory structure is created,
+    and the default configuration file is included.
+
+    Optionally specify the ROOT directory.
+    """
     initialize_site(root)