The adjective derived from the present active participle of imperfective verbs (called 'prechodnik' in Czech; e.g. the adjective 'delajici' derived from the imperfective participle 'delajic') is very common in present-day written Czech. On the contrary, the adjective derived from the present active participle of perfective verbs (e.g. 'udelajici' derived from 'udelajic') is extremely rare in written texts and perhaps non-existent for the native speaker of the Czech language. That is why all grammars of Czech either argue that this kind of verbal adjective does not exist in Czech or they do not mention it at all. In this paper, the author tries to show that this claim (or implicit assumption) is false. This type of adjective cannot be declared as non-existent because tens (and maybe hundreds) of different adjectives of the respective type (udelajici) are used in standard texts on the internet. It is also shown in this paper that this adjective cannot be rejected as non-systemic either. The last grammaticality criterion is valid as well: the general textual function of the verbal adjective is a nominalization of the potential attributive clause (e.g. 'vytvorici' for 'ktery vytvori' - creating (perfective) for who will create (perfective).