: Modelling software using the Unified Modelling Language (UML) also for embedded real-time systems (ERS) becomes more and more popular since the complexity of these systems increases as well as the pressure of short time-to-market timescales. These notes will introduce some extensions to the UML notation implemented in the CASE-tool Real-time Studio, their motivation and their integration with the common UML modelling procedures to ensure a complete picture of the embedded system to be developed.