diff --git a/src/JT809.Protocol/JT809.Protocol.xml b/src/JT809.Protocol/JT809.Protocol.xml
index 0b7440e..a8ed423 100644
--- a/src/JT809.Protocol/JT809.Protocol.xml
+++ b/src/JT809.Protocol/JT809.Protocol.xml
@@ -1043,15 +1043,15 @@
         <member name="F:JT809.Protocol.JT809Header.FixedByteLength">
             <summary>
             固定为22个字节长度
-            <para>MSG LENGTH + MSG_SN + MSG_ID + MSG_GNSSCENTERID + VERSION_FLAG + ENCRYPT_FLAG + ENCRYPT_KEY</para>
-            <para>4 + 4 + 2 + 4 + 3 + 1 + 4 = 22</para>
+            <para>MSG LENGTH + MSG_SN + MSG_ID + MSG_GNSSCENTERID + VERSION_FLAG + ENCRYPT_FLAG + ENCRYPT_KEY + TIME</para>
+            <para>4 + 4 + 2 + 4 + 3 + 1 + 4 + 8 = 30</para>
             </summary>
         </member>
         <member name="P:JT809.Protocol.JT809Header.MsgLength">
             <summary>
             数据长度(包括头标识、数据头、数据体和尾标识)
             <para>头标识 + 数据头 + 数据体 + 尾标识</para>
-            <para>1 + 22 + n + 1</para>
+            <para>1 + 30 + n + 1</para>
             </summary>
         </member>
         <member name="P:JT809.Protocol.JT809Header.MsgSN">