Update README.md

tamaskis · web-flow · commit de20e8e2440a · 2021-08-10T11:03:34.000-07:00
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 # Numerical Differentiation Toolbox [![View Numerical Differentiation Toolbox on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/97267-numerical-differentiation-toolbox)
 
-Functions to evaluate derivatives, partial derivatives, gradients, directional derivatives, Jacobian matrices, and Hessian matrices.
+This toolbox supplies functions to evaluate derivatives, partial derivatives, gradients, directional derivatives, Jacobian matrices, and Hessian matrices using the complex-step approximation of a derivative.
 
 
 ## Documentation
