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Nowadays, the significant advancement of mobile technologies has led to the possibility of accessing web services in a pervasive way and semantic web service discovery approaches seem to be the most promising approach to perform semantic matching. The proliferation of web services with similar functionalities is increasing rapidly. Thus, differentiation of the characteristics of web service offered has become more crucial. Without considering non-functional properties (NFPs) such as user requirement and quality standard of web services, it may result to irrelevant services to the users' need in mobile computing. Mobile users may discover unusable web services invoked, due to the device compatibility issues and lack of quality standard information in service description. This paper proposes WSMO-M(Mobile), an enhancement of WSMO to describe NFPs as a context and Quality of Web Service (QoWS) information for mobile computing environment. Initially, for annotating web service description, the context and QoWS models are specified by using Web Service Modeling Ontology (WSMO). Semantic matchmaking and degree of match calculation are also presented to define the importance of non-functional properties in mobile computing during the discovery and selection of web services. Finally, this paper demonstrates the applicability of the enhancement through a simple case study.