Altaic-type languages are characterized by the strong syntactic principle that the modifier always precedes the head. However in Sakha, one of Altaic-type languages, there are several postmodifiers that must follow the head noun against this principle. In addition, the postmodifier must agree in number with the preceding noun. This paper examines the semantic property of the postmodifiers and illustrates morphosyntactic structure of Sakha postmodification. No other Turkic languages show reverse word-order or agreement between the noun and the modifier. Although neighboring Tungusic languages have a similar structure called “agreement”, the similarity is merely superficial and Sakha postmodification does not show consistent similarity to either of two types of Tungusic “agreement”.