matters as compared with the rest of the population. However, as long as such action is needed to correct discrimination in fact, it is a case of legitimate differentiation under the Covenant. 11. Both article 2, paragraph 1, and article 26 enumerate grounds of discrimination such as race, colour, sex, language, religion, political or other opinion, national or social origin, property, birth or other status. The Committee has observed that in a number of constitutions and laws not all the grounds on which discrimination is prohibited, as cited in article 2, paragraph 1, are enumerated. The Committee would therefore like to receive information from States parties as to the significance of such omissions. 12. While article 2 limits the scope of the rights to be protected against discrimination to those provided for in the Covenant, article 26 does not specify such limitations. That is to say, article 26 provides that all persons are equal before the law and are entitled to equal protection of the law without discrimination, and that the law shall guarantee to all persons equal and effective protection against discrimination on any of the enumerated grounds. In the view of the Committee, article 26 does not merely duplicate the guarantee already provided for in article 2 but provides in itself an autonomous right. It prohibits discrimination in law or in fact in any field regulated and protected by public authorities. Article 26 is therefore concerned with the obligations imposed on States parties in regard to their legislation and the application thereof. Thus, when legislation is adopted by a State party, it must comply with the requirement of article 26 that its content should not be discriminatory. In other words, the application of the principle of non-discrimination contained in article 26 is not limited to those rights which are provided for in the Covenant. 13. Finally, the Committee observes that not every differentiation of treatment will constitute discrimination, if the criteria for such differentiation are reasonable and objective and if the aim is to achieve a purpose which is legitimate under the Covenant. 3