Colouring a graph with its chromatic number of colours is known to be NP-hard. Identifying an algorithm in which descisions are made locally with no information about the graph's global structure is particuarly challenging. In this article we analyse the complexity of a decentralised colouring algorithm that has recently been proposed for channel selection in wireless computer networks. 							
						
							
					 															
					Ken R. Duffy, N. O'Connell, Artëm Sapozhnikov