diff --git a/SM3性能优化.md b/SM3性能优化.md
index dc92c9a..e88348c 100644
--- a/SM3性能优化.md
+++ b/SM3性能优化.md
@@ -263,7 +263,7 @@ SM3的第一版，比SHA256复杂，不知道有没有继续优化的空间。
     // P1
     VPSHUFD $0x55, XTMP2, XTMP2;           \ // XTMP2 = W[-9] XOR W[-16] XOR (W[-3] rol 15) {xxAA}
     VPSRLQ  $17, XTMP2, XTMP3;             \ // XTMP3 = XTMP2 rol 15 {xxxA}
-    VPSRLQ  $9, XTMP2, XTMP4;              \ // XTMP4 = XTMP2 rol 9 {xxxA}
+    VPSRLQ  $9, XTMP2, XTMP4;              \ // XTMP4 = XTMP2 rol 23 {xxxA}
     VPXOR    XTMP2, XTMP4, XTMP4;          \ // XTMP4 = XTMP2 XOR (XTMP2 rol 15 {xxxA})
     VPXOR    XTMP4, XTMP3, XTMP4;          \ // XTMP4 = XTMP2 XOR (XTMP2 rol 15 {xxxA}) XOR (XTMP2 rol 23 {xxxA})