def _add_punctuation(text):
    """Add punctuation at the end of each chunk.

    Mimic2 expects some form of punctuation at the end of a sentence.
    """
    punctuation = ['.', '?', '!', ';']
    if len(text) >= 1 and text[-1] not in punctuation:
        return text + '.'
    else:
        return text
