Annotation of discourse relations is a project related to the Prague Dependency Treebank 2.5. It represents a new manually annotated layer of language description, above the existing layers of the PDT, and it portrays linguistic phenomena from the perspective of discourse structure and coherence. and GACR P406/12/0658, GACR P406/2010/0875, GACR 405/09/0729, Ministry of Education ME10018, Ministry of Education LM2010013