!address -summary command output for latest Windbg/SOS

I downloaded开发者_高级运维 and installed the latest version (6.12.2.633) of Debugging tools for windows. Running it with .NET 4.0. When I run !address -summary command seem like its output is different than what I used to see with previous version of Windbg/SOS for .NET 3.5. Anyone knows where can I find document for latest !address -summary command. SOS build-in help is not very helpful

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!address is a native extension command that is always available during user mode or kernel mode debugging. It displays information about the memory of the target application or computer. See also the documentation for this command.

It is possible to have multiple extensions loaded in WinDbg. You can use the .chain command to list the loaded extensions.

SOS is an extension dedicated to .NET debugging. It comes with its own set of commands to analyse memory used by managed applications, e.g. !eeheap -gc.