Index: doc/next-migration.txt
===================================================================
diff -u -r70aa197fe0c690035a2c339a841bf512e3e0b810 -r9063ec58e3c46495681147e8fd803fb10674241c
--- doc/next-migration.txt	(.../next-migration.txt)	(revision 70aa197fe0c690035a2c339a841bf512e3e0b810)
+++ doc/next-migration.txt	(.../next-migration.txt)	(revision 9063ec58e3c46495681147e8fd803fb10674241c)
@@ -1,5 +1,5 @@
 Migration Guide for the Next Scripting Language
-====================================================
+===============================================
 Gustaf Neumann <neumann@wu-wien.ac.at>
 v2.1, March 2011:
 :Author Initials: GN
@@ -2936,20 +2936,18 @@
 
 ==== Changing classes and superclasses
 
-NX does not define the methods +class+ and +superclass+ but allows to
-alter the class/superclass via +configure+. The class and superclass
+NX does not define the methods +class+ and +superclass+ (like XOTcl), but allows to
+alter all object/class relations (including class/superclass/object-mixin/...) +nsf::relation+. The class and superclass
 can be certainly queried in all variants with +info class+ or +info superclass+.
 [source,tcl]
 ----------------
 # NX example
 
 nx::Class create Foo
 Foo create f1
-# now alter the class of object f1
-f1 configure -class nx::Object
 
-# alternate approach via Next Scripting Framework
-::nsf::relation f1 class ::nx::Object
+# now alter the class of object f1
+nsf::relation f1 class ::nx::Object
 ----------------
 
 ==== Overwriting procs/methods with objects and vice versa