prerequisites.md

@@ -5,8 +5,8 @@
  * Lapack library
  * CMake
  * Swig
- * Python and Numpy
- * HDF5 library with Fortran support (optional)
+ * Python (>=2.7.3, 3 and above is better) and Numpy
+ * (optional) HDF5 library with Fortran support (>=1.10)
 
 * Optionnal but recommended package for use of pre-processor:
  * Scipy python module