diff --git a/CH582.md b/CH582.md
index 5bf3cc3..bc5316b 100644
--- a/CH582.md
+++ b/CH582.md
@@ -77,4 +77,7 @@ access the bootloader you must then desolder the battery.
 * [CH583 Evaluation Board SDK](https://github.com/openwch/ch583)
 
 * [Open Source Toolchain for CH582/CH583](https://github.com/cjacker/opensource-toolchain-ch32v)
+  
+  * Moonriver toolchain contains an older xpack and a custom openocd.
 
+  * The more recent xpack toolchain changes using `riscv-none-elf-` as PREFIX in the Makefile instead of `riscv-none-embed-`. This target also requires to activate extensions seperately by setting `-march=rv32imac_zicsr` instead of `-march=rv32imac`