\addvspace{length}
The \addvspace command normally adds a vertical space of height length. However, if vertical space has already been added to the same point in the output by a previous \addvspace command, then this command will not add more space than needed to make the natural length of the total vertical space equal to length.
\addvspace{delka}
Prikaz \addvspace vytvori vertikalni mezeru. Pokud pouzijete vice prikazu \addvspace primo po sobe, vytvori se pouze jedna mezera. Proto, pokud chcete vytvorit mezeru odlisne delky, musite pouzit argument.