In 1977, an amendment lengthened the residency requirement for naturalization to 20 years (15 years if in service to Bhutan), and the requirement of owning agricultural land was eschewed. Deprivation of citizenship as a punishment for sedition was expanded to associates and family relatives of seditious citizens. The amendment introduced other requirements, such as knowledge of Dzongkha and adherence to Ngalop customs. The amendment also introduced a procedural framework for citizenship and naturalization; namely it codified procedural requirements for census registration and births abroad and designated the Ministry of Home Affairs as the government agency to oversee immigration matters. The 1958 Act and 1977 amendments were superseded by the Bhutanese Citizenship Act 1985, though much of the procedural framework established in 1977 remains "de jure" in effect because it was not overridden.