How to add a chat command to the mutator

The code below adds a handler for the new chat command AddFakePlayers, which has one numeric argument (comes immediately after the command). The command works only for admins. Usage example: Mutator AddFakePlayers 5. This code should be placed inside the class that inherits the mutator (extends Mutator).

function Mutate(string MutateString, PlayerController Sender)
{
    local string Command;
    local int NParametr;
    local array<string> Parts;

    Split(MutateString, " ", Parts);
    Command = Parts[0];

    if (Parts.Length > 1)
        NParametr = int(Parts[1]);

    if (Command ~= "AddFakePlayers" && Sender.PlayerReplicationInfo.bAdmin)
        playersAdd = NParametr;

    if (NextMutator != None)
        NextMutator.Mutate(MutateString, Sender);
}