Update README.md

README.md

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 IDL based SED fitting code for stellar templates
 V1.1
 Ivano Baronchelli 2018
-BESTFIT is an IDL based function developed to fit photometric data using a collection of
-template models of star spectra. The method used is based on the χ 2 minimization technique.
+BESTFIT is an IDL based function that can be used to fit photometric data using a collection of
+template models of stellar spectra. The method used is based on the χ 2 minimization technique.
 Chosing among a collection of models (internal or supplied by the users), BESTFIT computes
 the spectral model that better fits the input photometric data. BESTFIT also predicts the
 expected flux in a users-selected photometric filter (or at a given wavelength). This can be
 useful in all those cases in which a rough photometrical calibration of the fluxes in a given
 band is needed or when the user wants to check the photometric calibration in a given band.
+The parameters and filters files look similar to those used by the hyperz software (Bolzonella+2000).
+This should make the use easier for people that previously used hyperz.
 
 For installation instructions and manual see the BESTFIT pdf manual included in this folder