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diff --git a/README.md b/README.md
index 1935b04..6dd255a 100644
--- a/README.md
+++ b/README.md
@@ -41,6 +41,7 @@ Spike supports the following RISC-V ISA features:
   - Debug v0.14
   - Smepmp extension v1.0
   - Smstateen extension, v1.0
+  - Sscofpmf v0.5.2
 
 As a Spike extension, the remainder of the proposed
 [Bit-Manipulation Extensions](https://github.com/riscv/riscv-bitmanip)