diff --git a/0x01.asm b/0x01.asm
new file mode 100644
index 0000000..a492c2d
--- /dev/null
+++ b/0x01.asm
@@ -0,0 +1,13 @@
+	BITS 64
+	SECTION .text
+	global main
+
+; calculate the fibonacci sequence.
+; n_2 = n_1 + n_0
+
+main:
+	mov rax, 1 ; inital values
+	mov rdx, 1
+	.loop: ; a label
+	xadd	rax, rdx ; swap rdx and rax, store rdx+rax into rax
+	loop	.loop ; jump back to the .loop label