diff --git a/README.md b/README.md
index d48bd05..2e5e22c 100644
--- a/README.md
+++ b/README.md
@@ -165,8 +165,8 @@ This is what generates expressions from tokens.
 ### Architecture
 
 - [ ] arm64
-- [ ] wasm
-- [x] x86-64
+- [ ] riscv
+- [x] x64
 
 ### Platform
 
diff --git a/src/build/arch/arm64/Registers.go b/src/build/arch/arm64/Registers.go
index 39c87b6..a00c709 100644
--- a/src/build/arch/arm64/Registers.go
+++ b/src/build/arch/arm64/Registers.go
@@ -1,4 +1,4 @@
-package register
+package arm64
 
 import "git.akyoto.dev/cli/q/src/build/cpu"
 
diff --git a/src/build/arch/riscv/Registers.go b/src/build/arch/riscv/Registers.go
new file mode 100644
index 0000000..846b936
--- /dev/null
+++ b/src/build/arch/riscv/Registers.go
@@ -0,0 +1,40 @@
+package riscv
+
+import "git.akyoto.dev/cli/q/src/build/cpu"
+
+const (
+	X0 cpu.Register = iota
+	X1
+	X2
+	X3
+	X4
+	X5
+	X6
+	X7
+	X8
+	X9
+	X10
+	X11
+	X12
+	X13
+	X14
+	X15
+	X16
+	X17
+	X18
+	X19
+	X20
+	X21
+	X22
+	X23
+	X24
+	X25
+	X26
+	X27
+	X28
+	X29
+	X30
+	X31
+)
+
+var SyscallArgs = []cpu.Register{X10, X11, X12, X13, X14, X15, X16}
diff --git a/src/build/arch/x64/encode.go b/src/build/arch/x64/encode.go
index 570076d..1f45001 100644
--- a/src/build/arch/x64/encode.go
+++ b/src/build/arch/x64/encode.go
@@ -29,6 +29,5 @@ func encode(code []byte, mod AddressMode, reg cpu.Register, rm cpu.Register, num
 
 	code = append(code, opCodes...)
 	code = append(code, ModRM(mod, byte(reg), byte(rm)))
-
 	return code
 }