pack.mcmeta

{
    "pack": {
        "description": "FRSM Resources",
        "pack_format": 3,
        "_comment": "A pack_format of 3 should be used starting with Minecraft 1.11. All resources, including language files, should be lowercase (eg: en_us.lang). A pack_format of 2 will load your mod resources with LegacyV2Adapter, which requires language files to have uppercase letters (eg: en_US.lang)."
    }
}