The Dzongkha Development Commission (རྫོང་ཁ་གོང་འཕེལ་ལྷན་ཚོགས), also called the DDC, is the pre-eminent body on matters pertaining to the Dzongkha language. The DDC was officially established in 1986 by Jigme Singye Wangchuk, the fourth king of Bhutan, to preserve and promote the use of Dzongkha as the national language of Bhutan. The DDC offices are now located in the Kawajangtsa area of Thimphu, close to the National Library of Bhutan and the Ministry of Education.