changed main description of the file

bSplines.hpp

@@ -8,12 +8,13 @@
  * The used algorithms are similar to and inspired by DeBoors algorithm
  * (https://en.wikipedia.org/wiki/De_Boor%27s_algorithm), but distinct.
  *
- * The useful function is called bSplinesWithDeriv() and is the one that should be used.
- * 
- * Both functions provide some code example, to give you an idea how to
- * use them.
- *
+ * This file contains three methods
+ * 1. ndxBsplinesHelper(ArrayXd &splines, ArrayXd &knotsInput, int index, uint nDeriv=1)
+ * 2. bSplinesWithDeriv(double x, ArrayXd &knotsInput, int kOrd, int nDeriv=0)
+ * 3. ndxBsplines(double x, ArrayXd &knotsInput, int kOrd, int nDeriv=1)
  *
+ * It is recommended to use ndxBsplines() if you just need the splines or just the derivative.
+ * In case you need both together use method bSplinesWithDeriv()
  */
 
 #pragma once