diff --git a/main.tex b/main.tex
index 7d198c4..a6563b4 100644
--- a/main.tex
+++ b/main.tex
@@ -180,7 +180,7 @@ In this work, we aim to address the above two issues in the framework of anchor-
 \begin{figure}[t]
         \centering
         \includegraphics[width=\linewidth]{thesis_figure/coord/localpolar.png}
-        \caption{Label construction for local polar head.}
+        \caption{Local (left) and global (right) polar coordinate system.}
         \label{lphlabel}
 \end{figure}
 %