The invention relates to an apparatus including at least one processor and at least one memory including a computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: convey a set of changeable sharing profiles to a node being a secondary user of the shared spectrum, the set of changeable sharing profiles including changeable spectrum sharing conditions; change at least one sharing profile of the set of changeable sharing profiles during shared spectrum usage, and indicate the change of the at least one sharing profile to the node being the secondary user of the shared spectrum.