clarify what it is

Author: mastercoms

README.md

@@ -56,7 +56,7 @@ Although configs are not recommended (use video options to customize), there are
 2. Clone this repo
 3. Open `/thirdparty/protobuf-2.5.0/vsprojects/libprotobuf.vcproj`
 4. Run both the Debug and the Release builds
-5. Run `regedit` and [fix whatever this is](https://github.com/ValveSoftware/source-sdk-2013/issues/72#issuecomment-326633328) (add a key at `HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\VisualStudio\10.0\Projects\{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}`, add a `String` property named `DefaultProjectExtension`, set the value to `vcproj`)
+5. Run `regedit` and [add an association for the latest VS](https://github.com/ValveSoftware/source-sdk-2013/issues/72#issuecomment-326633328) (add a key at `HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\VisualStudio\10.0\Projects\{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}`, add a `String` property named `DefaultProjectExtension`, set the value to `vcproj`)
 6. Set the [environment variable](https://superuser.com/a/985947) `VALVE_NO_AUTO_P4` to `true` and `PreferredToolArchitecture` to `x64`.
 7. Run `/creategameprojects_dev.bat`
 8. Open `/games.sln`