diff --git a/README.md b/README.md
index bcd6674..c8b70d9 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This repositiory contains prototypical RISC-V implementation of ThreadX designed
 
 ## Building the RTOS
 
-Two presets are provided, targetting RV32GC and RV64GC.
+Four presets are provided, targetting RV32 and RV64 combined with GC or IMAC. The presets use rv32imac and rv64imac.
 
 ## Running on the VP