diff --git a/final/thesis_peng.pdf b/final/thesis_peng.pdf
index d8ca8e8..d9ffd94 100644
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diff --git a/final/thesis_peng.synctex.gz b/final/thesis_peng.synctex.gz
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diff --git a/source/chapters/chapter2_1.tex b/source/chapters/chapter2_1.tex
index 6b4e8bf..7b2beba 100644
--- a/source/chapters/chapter2_1.tex
+++ b/source/chapters/chapter2_1.tex
@@ -405,14 +405,14 @@ \subsection{AirPlay\label{2_2_3}}
 specifications have been made by some hackers through reverse engineering the
 protocol stack. These unofficial specifications could be found on the
 Internet\footnote{\url{http://nto.github.io/AirPlay.html}}.
-Figure \ref{airplay_use_scenario} shows a typical use scenario
+Figure \ref{airplay_use_scenario} shows the playback architecture
 of AirPlay. The AirPlay specification includes 6 parts, including service discovery, video
 streaming, photo streaming, music streaming, screen mirroring and
 authentication.
 \clearpage
 \begin{figure}[htb] 
 \centering \includegraphics[height=9cm]{charts/airplay} 
-\caption{AirPlay use scenario\label{airplay_use_scenario}} 
+\caption{AirPlay playback architecture\label{airplay_use_scenario}} 
 \end{figure}  
 \textbf{Service discovery}
 
@@ -599,7 +599,7 @@ \subsection{DIAL\label{2_2_4}}
 
 \begin{figure}[htb] 
 \centering \includegraphics[width=0.8\columnwidth]{charts/DIAL} 
-\caption{DIAL use scenario\label{DIAL_use_scenario}} 
+\caption{DIAL playback architecture\label{DIAL_use_scenario}} 
 \end{figure}  
 
 \textbf{DIAL Service Discovery}
@@ -660,7 +660,7 @@ \subsection{Miracast\label{2_2_5}} %NOT Edited
 the same local network, a Wi-Fi peer to peer connection will be created when
 needed. This makes Miracast more adaptive than other technologies, in other
 words, Miracast is not limited to the pre-configured network infrastructure.
-Figure \ref{miracast_use_scenario} shows the use scenario of Mircast, the
+Figure \ref{miracast_use_scenario} shows the playback architecture of Mircast, the
 service discovery is based on Wi-Fi Direct technology. After the connection to
 the receiver device is established, the whole screen of the sender device is
 recorded and transferred to the receiver device in real time. If the streamed
@@ -670,7 +670,7 @@ \subsection{Miracast\label{2_2_5}} %NOT Edited
 
 \begin{figure}[htb] 
 \centering \includegraphics[width=1\columnwidth]{charts/miracast} 
-\caption{Miracast use scenario\label{miracast_use_scenario}} 
+\caption{Miracast playback architecture\label{miracast_use_scenario}} 
 \end{figure}  
 
 Another point worth mentioning is that Miracast utilizes many Wi-Fi alliance