In the paper, we explore the potential of sketchnoting as a tool for constructing learner´s knowledge. Sketchnoting is non-linear note-taking method that combines text and visual elements to express knowledge in a complex form, and is represented by text, symbols, arrows, frames, and other visual elements. Drawing on theory of dual coding and theory of multimedia learning, it is argued that a learner retains information more permanently if they process it verbally and visually at the same time. Sketchnoting can be effectively implemented in a learning process. We illustrate sketchnoting as a supportive learning tool by empirical study with learners at geography lessons in a secondary grammar school. We assessed twenty students´ first sketchnotes and found out most of them focused on facts rather than relations. It is therefore suggested that teachers draw more attention to organisation, structure and interrelations of the elements of knowledge in sketchnote when introducing it first to learners.