diff --git a/MFMM.md b/MFMM.md
index cf307d2..73f7caf 100644
--- a/MFMM.md
+++ b/MFMM.md
@@ -169,13 +169,12 @@ acc0 - H(acc0 * 2^32) >= 0, acc0 - L(acc0 * 2^32) >= 0 显然。
 	SHRQ $32, DX
 	MOVQ acc0, t0
 	SUBQ AX, t0
-	MOVQ acc0, t1
-	SUBQ DX, t1
+	SUBQ DX, acc0
 	
 	ADDQ t0, acc1
 	ADCQ $0, acc2
 	ADCQ $0, acc3
-	ADCQ t1, acc4
+	ADCQ acc0, acc4
 	ADCQ $0, acc5
 	
 	SUBQ DX, acc2