The paper deals with automatic stressing of the Lithuanian text. In the previous work the author presented an algorithm for automatic stressing of the Lithuanian text on the basis of a dictionary. The aim of the present work is to improve the above mentioned algorithm by including formal stressing rules for nouns and adjectives. By means of these rules such words as diminutives, names and degrees of adjectives that are not present in the dictionary may be stressed. The work analyses when it is more convenient to formulate rules manually and when to generate them automatically. A method for formulating rules manually has been described and a set of such rules has been presented. Besides the algorithm for generating stressing rules with the help of a dictionary of stems of nouns and adjectives has been given.