helm repo index

helm repo index
Error: "helm repo index" requires 1 argument 

Usage:  helm repo index [DIR] [flags]

See also

• helm repo [ add | update | list | index | remove ], helm search
• Helm, helm [ repo | template | list | install | unsintall | create | show | pull | push | status | history | plugin | search | upgrade | delete | lint | test | package | dependency | get | rollback | version | --help], helm@2, Chart file structure, Helm Charts, values.yaml, chart.yaml, Helm functions, Helm versions, helmfileDeprecated: init , variables, Mapkubeapis