Remember that the exponential smoothing forecast is based on last$$ period's forecast and the fraction of the difference between last$$ period's forecast and actual$$ demand:

Upper F Subscript t Baseline equals Upper F Subscript t minus $1$ Baseline plus alpha left parenthesis Upper A Subscript t minus $1$ Baseline minus Upper F Subscript t minus $1$ Baseline right parenthesis comma where alpha equals smoothing constant between $0$ and $1.$