--- a/cs.rst	Sat May 28 18:52:14 2016 +0300
+++ b/cs.rst	Sun May 29 19:26:03 2016 +0300
@@ -6,6 +6,30 @@
 .. contents::
    :local:
 
+.Net versions compatibility
+===========================
+
+The .NET Framework versions 2.0, 3.0, and 3.5 are built with the same version of
+the CLR (CLR 2.0). These versions represent successive layers of a single
+installation. Each version is built incrementally on top of the earlier
+versions. It is not possible to run versions 2.0, 3.0, and 3.5 side by side on a
+computer. When you install version 3.5, you get the 2.0 and 3.0 layers
+automatically, and apps that were built for versions 2.0, 3.0, and 3.5 can all
+run on version 3.5. However, the .NET Framework 4 ends this layering approach.
+
+NET Framework 4.5 is included with Windows 8, the .NET Framework 4.5.1 is
+included with Windows 8.1 and the .NET Framework 4.6 is included with
+Windows 10.
+
+Installing .Net 3.5 on Windows 8 and 10 is possible via "Control Panel", click
+on "Turn Windows features on or off" under "Programs and Features".
+
+https://msdn.microsoft.com/en-us/library/bb822049.aspx
+  .NET Framework Versions and Dependencies.
+https://msdn.microsoft.com/en-us/library/hh506443.aspx
+  Installing the .NET Framework 3.5 on Windows 8, Windows 8.1 and Windows 10.
+
+
 Decompiler.
 ===========