The notion of commitments plays a pivotal role in understanding joint action (Cohen and Levesque 1991; Bratman, 1992). However, the study of commitments in the context of joint action for human-robot interaction is quite new. We discuss two specific proposals to commitments: the functional approach, which argues that the central function of commitments is to reduce different forms of uncertainty; and the normative approach, which argues that commitments create obligations towards one's co-agents who are entitled to demand that these obligations be satisfied. For demonstration purpose, we consider 2 use-cases. In the first one, a robot guide indicates a direction to a visitor by pointing/indicating a destination (e.g. Pepper in a Mall). In the second one, a robot guide brings a visitor toward its destination (e.g. Rackham at the Space City Museum). We conclude that both approaches capture fundamental aspects to handle commitments in the context of human-robot interaction.