diff --git a/data/ch_wireshark/sec_tcp.tex b/data/ch_wireshark/sec_tcp.tex
index 68ce846..14a3540 100644
--- a/data/ch_wireshark/sec_tcp.tex
+++ b/data/ch_wireshark/sec_tcp.tex
@@ -53,7 +53,7 @@ TCP 报文段结构如图\ref{fig:c:wireshark_TCP-structure}所示，
 \begin{figure}[!ht]
   \centering
   \includegraphics[width=10cm]{TCP-structure}
-  \caption{TCP报文段结构标意图}
+  \caption{TCP报文段结构示意图}
   \label{fig:c:wireshark_TCP-structure}
 \end{figure}