diff --git a/changelog.tex b/changelog.tex
index 4b1a851..2db1e4b 100644
--- a/changelog.tex
+++ b/changelog.tex
@@ -1,4 +1,5 @@
 \begin{versionhistory}
   \vhEntry{1.0}{27/02/2017}{Liu Siyuan}{created}
   \vhEntry{1.1}{07/03/2017}{Liu Siyuan}{update cluster address, add monitoring information}
+  \vhEntry{1.2}{22/03/2017}{Liu Siyuan}{add OS and package information}
 \end{versionhistory}
\ No newline at end of file
diff --git a/cover.tex b/cover.tex
index bfb500f..718c1c3 100644
--- a/cover.tex
+++ b/cover.tex
@@ -20,7 +20,7 @@
 % Bottom of the page
 \textsc{\bfseries NTU HPC Team}
 \\
-\textbf{http://ntuhpc.org}
+\textbf{https://ntuhpc.org}
 
 \end{center}
 \end{titlepage}
diff --git a/main.tex b/main.tex
index 398dfab..75a0bf2 100644
--- a/main.tex
+++ b/main.tex
@@ -6,6 +6,7 @@
 \usepackage{graphicx}
 \usepackage{float}
 \usepackage{multirow}
+\usepackage[table,xcdraw]{xcolor}
 \usepackage{listings}
 \usepackage[a4paper, total={6.3in, 9.4in}]{geometry}
 \usepackage{color}
@@ -54,5 +55,6 @@
 \input{sections/compilation.tex}
 \input{sections/jobs.tex}
 \input{sections/monitoring.tex}
+\input{sections/appendix.tex}
 
 \end{document}
diff --git a/sections/access.tex b/sections/access.tex
index a6d0002..8fb3b6d 100644
--- a/sections/access.tex
+++ b/sections/access.tex
@@ -23,7 +23,7 @@ \section{Accessing the cluster}
 
 \subsection{Changing password}
 
-Upon successful login, it's the user's responsibility to change his/her password. To change password
+Upon successful login, it's the user's responsibility to change his/her password. To change password, type
 
 \begin{lstlisting}
 $ yppasswd
@@ -37,7 +37,7 @@ \subsection{Changing shell}
 $ ypchsh -s /path/to/your/shell
 \end{lstlisting}
 
-\noindent For example, to change default shell to ZSH
+\noindent For example, to change default shell to ZSH, use
 
 \begin{lstlisting}
 $ ypchsh -s /bin/zsh
diff --git a/sections/appendix.tex b/sections/appendix.tex
new file mode 100644
index 0000000..d5b55eb
--- /dev/null
+++ b/sections/appendix.tex
@@ -0,0 +1,26 @@
+\newpage
+\appendix
+
+\section{Available packages} \label{packages}
+
+\begin{table}[H]
+\centering
+\label{table:packages}
+\begin{tabular}{|l|l|l|}
+\hline
+\rowcolor[HTML]{FCFF2F} 
+\textbf{Package} & \textbf{Description} & \textbf{Category}                \\ \hline
+GCC 4.9.4        &                      &                                  \\ \cline{1-2}
+GCC 5.4.0        &                      &                                  \\ \cline{1-2}
+GCC 6.3.0        &                      & \multirow{-3}{*}{Compilers}      \\ \hline
+OpenMPI 1.10.3   &                      &                                  \\ \cline{1-2}
+OpenMPI 2.0.2    &                      & \multirow{-2}{*}{MPI}            \\ \hline
+FFTW 3.3.4       &                      &                                  \\ \cline{1-2}
+OpenBLAS 0.2.18  &                      &                                  \\ \cline{1-2}
+ScaLAPACK 2.0.2  &                      & \multirow{-3}{*}{Math libraries} \\ \hline
+CUDA 8.0.44      &                      & CUDA                             \\ \hline
+Python 2.7.12    &                      & Programming languages            \\ \hline
+protobuf 3.2.0   &                      & Common libraries                 \\ \hline
+CMake 3.7.1      &                      & Utilities                        \\ \hline
+\end{tabular}
+\end{table}
\ No newline at end of file
diff --git a/sections/compilation.tex b/sections/compilation.tex
index 539c697..00332f0 100644
--- a/sections/compilation.tex
+++ b/sections/compilation.tex
@@ -1,10 +1,10 @@
 \section{Compiling application}
 
-The NTU HPC cluster employs the Lmod system to manage the compilers and libraries. This system allows users to easily load a package, switch between different versions of a package, and unload a package. These features are implemented by smartly user's environment variables (e.g. \lstinline{PATH}, and \lstinline{LD_LIBRARY_PATH}) under the hood. The changes are only effective for users' current session.
+The NTU HPC cluster employs the Lmod system to manage the compilers and libraries. This system allows users to easily load a package, switch between different versions of a package, and unload a package. These features are implemented by smartly changing user's environment variables (e.g. \lstinline{PATH}, and \lstinline{LD_LIBRARY_PATH}) under the hood. The changes are only effective for users' current session. A list of packages available on the cluster in presented in Appendix \ref{packages}.
 
 \subsection{Basic Lmod commands}
 
-To check what are the available package, use
+To check what are the available packages, use
 
 \begin{lstlisting}
 $ module av
diff --git a/sections/overview.tex b/sections/overview.tex
index f8d2022..c5804cd 100644
--- a/sections/overview.tex
+++ b/sections/overview.tex
@@ -17,6 +17,7 @@ \subsection{Cluster architecture}
 \textbf{Memory}     & DDR3 32GB                                \\ \hline
 \textbf{Hard drive} & 480GB SATA HDD                           \\ \hline
 \textbf{Network}    & 1Gbit/s Ethernet                         \\ \hline
+\textbf{Operating system} & CentOS 7.2                         \\ \hline
 \end{tabular}
 \end{table}
 
@@ -32,6 +33,7 @@ \subsection{Cluster architecture}
 \textbf{Memory}     & DDR3 48GB                                      \\ \hline
 \textbf{Hard drive} & 480GB SATA HDD                                 \\ \hline
 \textbf{Network}    & 1Gbit/s Ethernet                               \\ \hline
+\textbf{Operating system} & CentOS 7.2                         \\ \hline
 \end{tabular}
 \end{table}