Index: trunk/psLib/src/math/psMinimize.h
===================================================================
--- trunk/psLib/src/math/psMinimize.h	(revision 1468)
+++ trunk/psLib/src/math/psMinimize.h	(revision 1469)
@@ -24,4 +24,7 @@
 );
 
+/** derivative function of psMinimizeFunction
+ *
+ *  @return float     the derivative in respect to params[derivParam]
 typedef float (*psMinimizeFunctionDeriv) (
     const psVector* restrict params,   ///< collection of parameters
@@ -29,5 +32,5 @@
     int derivParam                     ///< index of parameter to calculate derivative of
 );
-
+ 
 /** Minimizes a non-linear function.
  *