diff --git a/README.md b/README.md
index e6072b0..966fb13 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,8 @@ inegrating TDD scripts using Cmake.
 - clang/gcc
 - clangd
 - CppUTest(for unit tests)
-- NewLIB/newlib-nano
+- NewLIB/newlib-nano(USE musl actually)
+- riscv toolchain [xpack RISC-V TC](https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases)
 
 
 ## Installing toolchain