diff --git a/SM3性能优化.md b/SM3性能优化.md
index 3814498..f82caf8 100644
--- a/SM3性能优化.md
+++ b/SM3性能优化.md
@@ -92,7 +92,7 @@ SM3的第一版，比SHA256复杂：
     VPALIGNR $12, XDWORD3, XTMP2, XTMP3;   \ // XTMP3 = {..., W[1], W[0], w15}
     VPSHUFD $80, XTMP3, XTMP4;             \ // XTMP4 =  = W[-3] {DDCC}
     VPSLLQ  $15, XTMP4, XTMP4;             \ // XTMP4 = W[-3] rol 15 {xDxC}
-    VPSHUFB shuff_DC00<>(SB), XTMP4, XTMP4;\ // XTMP4 = W[-9] XOR W[-16] XOR (W[-3] rol 15){DC00}
+    VPSHUFB shuff_DC00<>(SB), XTMP4, XTMP4;\ // XTMP4 = W[-3] rol 15 {DC00}
     VPXOR   XTMP1, XTMP4, XTMP4;           \ // XTMP4 = W[-9] XOR W[-16] XOR (W[-3] rol 15) {DCxx}
     VPSLLD   $15, XTMP4, XTMP5;            \