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@@ -21,6 +21,10 @@ This section is primarily a series of useful links found online
 * [3.0 PDF](https://openpowerfoundation.org/?resource_lib=power-isa-version-3-0)
 * [2.07 PDF](https://openpowerfoundation.org/?resource_lib=ibm-power-isa-version-2-07-b)
 
+## Overview of the user ISA:
+
+https://devblogs.microsoft.com/oldnewthing/20180806-00/?p=99425
+
 # RISC-V Instruction Set Architecture
 
 **PLEASE UPDATE** - we are no longer implementing full RISCV, only user-space