Error occured when trying to enable spfeature via powershell

Hi All,

When try to execute "enable-spfeature –identify "OffWfCommon" –url http://site". How to fix this?

Enable-SPFeature : A parameter cannot be found that matches parameter name
'identify'.
At line:1 char:18
+ enable-spfeature -identify "OffWfCommon"    -url  http://site
+                  ~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Enable-SPFeature], Paramet
   erBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.SharePoint.Powe
   rShell.SPCmdletEnableFeature