diff --git a/README.md b/README.md
index 0b097ced0d..d83b34930f 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ Spike supports the following RISC-V ISA features:
   - Svnapot extension, v1.0
   - Svpbmt extension, v1.0
   - Svinval extension, v1.0
+  - CMO extension, v1.0
   - Debug v0.14
 
 As a Spike extension, the remainder of the proposed