diff --git a/src/Standart.Hash.xxHash/xxHash64.Unsafe.cs b/src/Standart.Hash.xxHash/xxHash64.Unsafe.cs
index 9208adf..ae09a7b 100644
--- a/src/Standart.Hash.xxHash/xxHash64.Unsafe.cs
+++ b/src/Standart.Hash.xxHash/xxHash64.Unsafe.cs
@@ -111,7 +111,7 @@
             if (ptr <= end - 4)
             {
                 h64 ^= *((uint*)ptr) * p1;
-                h64 = BitUtils.RotateLeft(h64, 23) * p2 + p3; // (rotl 27) * p2 + p3
+                h64 = BitUtils.RotateLeft(h64, 23) * p2 + p3; // (rotl 23) * p2 + p3
                 ptr += 4;
             }