¿Hay una función para agregar al corpus existente? Ya he generado mi matriz, estoy buscando agregar periódicamente a la tabla sin volver a procesar todo el sha-bang

p.ej;

articleList = ['here is some text blah blah','another text object', 'more foo for your bar right now']
tfidf_vectorizer = TfidfVectorizer(
                        max_df=.8,
                        max_features=2000,
                        min_df=.05,
                        preprocessor=prep_text,
                        use_idf=True,
                        tokenizer=tokenize_text
                    )
tfidf_matrix = tfidf_vectorizer.fit_transform(articleList)

#### ADDING A NEW ARTICLE TO EXISTING SET?
bigger_tfidf_matrix = tfidf_vectorizer.fit_transform(['the last article I wanted to add'])