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diff --git a/kernel/README_KERNEL_VERSIONS.txt b/kernel/README_KERNEL_VERSIONS.txt
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+07/21/2011
+
+To ease development and maintenance of the siw kernel module
+source code, it has been splitted into two independent directories
+softiwarp/ and softiwarp_old/. both directories keep all files
+needed to build a siw kernel module. 
+
+softiwarp/
+contains the code aligned to the current linux kernel development
+tree. it does not contain any legacy code to run with older kernels.
+this code is updated frequently, but runs only on newer kernels.
+it has been tested for kernels back to kernel version 2.6.36.2.
+code documentation (IMPLEMENTATION.txt) will be updated within
+the next days.
+
+softiwarp_old/
+contains code which compiles and runs on older kernels, but may
+soon break on newer kernels. code maintenance is sloppy and
+it is recommended to use the newer softiwarp/ code base if 
+possible.
+
+
+06/13/2014
+
+softiwarp_old/ has been removed.
+
+
+01/20/2015
+
+With kernel version 3.15 the OFA core changed the way it maintains
+registered user communication buffers. The new code would result
+in inefficient initialization of RDMA data source or sink location for
+a software RDMA stack. Therefore, siw abandons using OFA core
+user page management (ib_umem_get() etc.) and implememnts its
+own simple, but better suited management of pinned user pages.