diff --git a/kernel/sysabi.md b/kernel/sysabi.md
index f9139e7..13eefe1 100644
--- a/kernel/sysabi.md
+++ b/kernel/sysabi.md
@@ -12,6 +12,10 @@ To perform a syscall, you need to populate the following registers:
 | rdx      | Argument 3      |
 | rcx      | Argument 4      |
 
+Then you need to call interrupt `0x80`.
+
+libnx provides abstractions for all syscalls.
+
 ---
 
 The following calls should be implemented to some degree in noxos 1.0.