src/Guzzle/Service/Description/Operation.php
public function addParam(Parameter $param)
    {
        $this->parameters[$param->getName()] = $param;
        $param->setParent($this);

        return $this;
    }
public function addParam(Parameter $param)
    {
        $this->parameters[$param->getName()] = $param;
        $param->setParent($this);

        return $this;
    }
public function addParam ( Parameter $ param ) { $ this -> parameters [ $ param -> getName ( ) ] = $ param ; $ param -> setParent ( $ this ) ; return $ this ; }
Add a parameter to the command

@param Parameter $param Parameter to add

@return self
Add a parameter to the command