update README.md

riscv-software-src · Jul 9, 2022 · 8fbeaab · 8fbeaab
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@@ -39,6 +39,7 @@ Spike supports the following RISC-V ISA features:
   - CMO extension, v1.0
   - Debug v0.14
   - Smepmp extension v1.0
+  - Smstateen extension, v1.0
 
 As a Spike extension, the remainder of the proposed
 [Bit-Manipulation Extensions](https://github.com/riscv/riscv-bitmanip)