diff --git a/MFMM.md b/MFMM.md
index f0fae37..e3450e8 100644
--- a/MFMM.md
+++ b/MFMM.md
@@ -106,7 +106,7 @@ acc0, acc1, acc2, acc3, acc4, acc5是64位寄存器
 
     arm64 汇编表示为
 	MUL	const1, acc0, t0
-        ADCS    t0, acc1, acc1       // (carry1, acc1) = acc1 + L(acc0*p1)
+        ADDS    t0, acc1, acc1       // (carry1, acc1) = acc1 + L(acc0*p1)
 	UMULH	const1, acc0, y0     // y0 = H(acc0*p1)
 
 	MUL	const2, acc0, t0