diff --git a/SM3性能优化.md b/SM3性能优化.md
index 4ab2d80..244bc75 100644
--- a/SM3性能优化.md
+++ b/SM3性能优化.md
@@ -21,7 +21,7 @@
     VPADDD   XDWORD0, XTMP0, XTMP0;       \ // XTMP0 = W[-7] + W[-16] = {w12+w3, w11+w2, w10+w1, w9+w0}
     VPALIGNR $4, XDWORD0, XDWORD1, XTMP1; \ // XTMP1 = W[-15] = {w4,w3,w2,w1}
     VPSRLD   $7, XTMP1, XTMP2;            \ // XTMP2 = W[-15] >> 7 = {w4>>7,w3>>7,w2>>7,w1>>7}
-    VPSLLD   $(32-7), XTMP1, XTMP3;       \ // XTMP3 = W[-15] << 28 = {w4<<25,w3<<25,w2>>25,w1<<25}
+    VPSLLD   $(32-7), XTMP1, XTMP3;       \ // XTMP3 = W[-15] << 25 = {w4<<25,w3<<25,w2<<25,w1<<25}
     VPOR     XTMP2, XTMP3, XTMP3;         \ // XTMP3 = W[-15] ror 7 = {ROTR(7,w4),ROTR(7,w3),ROTR(7,w2),ROTR(7,w1)}
     VPSRLD   $18, XTMP1, XTMP2;