In view of the request by the Federal Republic of Germany to join the agreement on cooperation in astrophysical research and the protocol between the governments of the Kingdom of Spain, the Kingdom of Denmark, the United Kingdom of Great Britain and Northern Ireland and the Kingdom of Sweden, signed in Santa Cruz de La Palma on the 26th of May of 1979, and published in the official State bulletin no.161 on the 6th of July of 1979, the signatory bodies consider that it is necessary to introduce an addendum to the protocol on co-operation in astrophysical research in the following terms:

The aforementioned protocol referring exclusively to the Observatory at Roque de los Muchachos shall be extended to include the Observatory of Teide in accordance with the provisions of the Protocol with the exception of the modifications introduced by the present Addendum.