There is provided mechanisms for signalling TCI states. A method is performed by a network node. The network node is configured to control transmission of reference signals from at least two TRPs. The method comprises signalling, towards user equipment is served by the network node, a sequence of TCI states defined for a reference signal burst in which the reference signals are to be transmitted from the TRPs. At least one of the TCI states in the sequence of TCI states is representative of one of the reference signals to be jointly transmitted on a beamform from a first TRP of the TRPs and on a beamform from a second TRP of the TRPs. The method comprises initiating transmission of the reference signal burst from the TRPs.