A word, phrase or clause that follows a verb and which simply adds further information concerning, usually, the verb's subject. Complements usually follow stative verbs such as 'to be' to create a statement (i.e. a declarative sentence), e.g. 'He is happy'. Here the adjective 'happy' is the subject complement. However, in the sentence, 'He made me happy', the adjective happy is called an object complement as it gives more information about the verb's object, me.

» Linguistic Library (Mike Green)