The Law on the National Coat of Arms, Flag and Anthem is a set of rules and guidelines passed by the Mexican government on the display and use of the flag (bandera), coat of arms (escudo) and the anthem (himno). The original law was passed in 1984 and it contains 7 chapters, a preamble and a section that contains the lyrics of the national anthem. The law itself was changed several times, most recently in 2005.