diff --git a/README b/README
index 30d0f67..6347b9c 100644
--- a/README
+++ b/README
@@ -266,12 +266,24 @@ In order to build libupnp under Windows the pthreads-w32 package is required.
 You can download a self-extracting ZIP file from the following location:
 
 ftp://sources.redhat.com/pub/pthreads-win32/pthreads-w32-2-7-0-release.exe
+or possibly newer versions if available.
 
 Execute the self-extracting archive and copy the Pre-build.2 folder to the
 top level source folder.
 Rename Pre-build.2 to pthreads. 
 Open the provided workspace build\libupnp.dsw with Visual C++ 6.0 and select
 Build->Build libupnp.dll (F7)
+In the build directory there are also VC8, VC9 and VC10 folders containing
+solution files for Visual Studio 2005/2008/2010 respectively.
+
+If you use newer versions to build libupnp, eg Visual Studio 2003 or later,
+then you need to rebuild the pthreads package so it uses the same VC runtime
+as libupnp to prevent cross boundary runtime problems
+(see http://msdn.microsoft.com/en-us/library/ms235460%28v=VS.100%29.aspx).
+Just replace the files in the Pre-build.2 folder (renamed to pthreads as
+mentioned above) with the newly build versions.
+If you also use a newer version of pthreads-win32 then you should also
+replace the header files in that directory structure (obviously).
 
 For building a static library instead of a DLL and for using the static
 pthreads-w32 library following switches need to be defined additionally: