1. A method for providing oral modification of an automatic speech recognition (‘ASR’) lexicon of an ASR engine, the method comprising: receiving, in the ASR engine from a user through a multimodal application, speech for recognition, wherein the ASR engine comprises an ASR lexicon of words that the ASR engine recognizes, and the ASR lexicon does not contain at least one word of the speech for recognition; indicating by the ASR engine through the multimodal application to the user that the ASR lexicon does not contain the word by returning a message that explicitly indicates that the ASR engine does not recognize the word; receiving by the ASR engine from the user through the multimodal application an oral instruction to add the word to the ASR lexicon, the oral instruction accompanied by an oral spelling of the word from the user; and executing the instruction by the ASR engine.