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+arch/x86/include/README.txt
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This directory holds x86-specific header files.  The top-level header files in
+arch/x86/include simply include corresponding header files from lower lower-
+level chip-specific and architecture-specific directories.
+
+Architecture-Specific Directories
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Architecture-specific directories hold common header files for specific x86
+architectures.  Separating these header file makes it easy to manage such
+things as differences in sizeof(long) on 32- and 64-bit x86 architectures.
+
+i486
+  This directory holds definitions appropriate for any instantiation of the
+  32-bit i486 architecture.
+
+Chip-Specific directories
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The same x86 architecture may be realized in different chip implementations.
+For SoC chips, in particular, on-chip devices and differing interrupt
+structures may require special, chip-specific definitions in these chip-
+specific directories.
+
+qemu
+  This is the implementation of NuttX on the QEMU x86 simulation.
+
+
+