There are provided mechanisms for associating metadata with a multimedia file. The method is performed by a mood detector. A method includes detecting presence of a mood indicator in the multimedia file by a mood detection module analysing the multimedia file. The method includes determining a mood descriptive value by a mood classification module analysing a segment of the multimedia file, wherein the segment is defined by the mood indicator. The method further includes associating the mood descriptive value with the multimedia file as metadata. Detecting presence of the mood indicator by the mood detection module acts as a trigger to determine the mood descriptive value by the mood classification module.