If your stocks are current 100% US (like VTI, SPY) then this is further diversifying, if its currently mixed (like VT) this this would actually be less diversification (e.g. 80% VT / 20% bond is close to 50% us stock, 30%international, 20% bond). I'm currently 50% US stock, 20% international, 17% cash and 13 bond, but I do plan to spend down at least half of that cash the first few years of my upcoming RE.