This tool was developed as a first step towards more accurate automatic rhetorical analysis for Brazilian Portuguese, following RST (Rhetorical Structure Theory) (Mann and Thompson, 1987). It is part of DiZer project (Pardo, 2005) and uses the parser PALAVRAS (Bick, 2000). The tool purpose is to automatically detect discourse segments (i.e., text segments that express minimum content units - propositions) that will be used for building the corresponding RST tree.