Google Now learns to understand corrections
Corrections look to be pretty easy too. If Google mishears you, all you have to do is say, "No, I said..." and then repeat the word. We assume that on the Google side, the system will check for homophones and similar sounding words and figure out which is most likely based on what you had said previously. The example Google gives is asking about the Renaissance and then searching for "baroque artists", but the system hears "broke artists". Simply say, "No, I said baroque," and Google will correct itself.
Google says that the feature should be live for anyone running the Android or iOS Google Search app, so keep it in mind for the next time Google mishears you.