Where do you find Invoke-GPUpdate?

This doesn't seem to be built in. When I run Invoke-GPUpdate from PowerShell, I get the following error: PS H:\> Invoke-GPUpdate The term 'Invoke-GPUpdate' is not recognized as the name of a cmdlet, function, script file, or operable program. Check  the spelling of the name, or if a path was included, verify that the path is correct and try again. At line:1 char:16 + Invoke-GPUpdate <<<<     + CategoryInfo          : ObjectNotFound: (Invoke-GPUpdate:String) [], CommandNotFou