bower/templates/json/help-update.json

{
    "command": "update",
    "description": "Updates installed packages to their newest version according to bower.json",
    "usage": [
        "update <name> [<name>, ..]"
    ],
    "options": [
        {
            "shorthand": "-p",
            "flag": "--production",
            "description": "Do not install project devDependencies"
        }
    ]
}