diff --git a/doa_doppler_est.tex b/doa_doppler_est.tex
index cff28d3..69ca563 100644
--- a/doa_doppler_est.tex
+++ b/doa_doppler_est.tex
@@ -148,7 +148,7 @@
 % \input{parts/sec8_beamforming.tex}        % 预留，本次不展开
 
 \appendix
-\renewcommand{\thesection}{\Alph{section}}
+\renewcommand{\thesection}{\texorpdfstring{\Alph{section}}{附录 \Alph{section}}}
 \titleformat{\section}{\normalfont\Large\bfseries}{附录~\thesection}{1em}{}
 \titlespacing*{\section}{0pt}{*0}{*0}
 \renewcommand{\thesubsection}{\Alph{section}.\arabic{subsection}}