diff --git a/documents/ros-setup.1 b/documents/ros-setup.1
index 3e2dd1d..fb25ea0 100644
--- a/documents/ros-setup.1
+++ b/documents/ros-setup.1
@@ -1,15 +1,25 @@
 .TH "ros-setup" "1" "" "" ""
 .nh \" Turn off hyphenation by default.
 .PP
-ros\-setup \- install sbcl\-bin and quicklisp
+ros\-setup \- setup the backend of roswell
 .SH Synopsis
 .PP
 \f[B]ros setup\f[]
 .SH Description
 .PP
-Runs some initial setup of roswell.
+\f[B]ros setup\f[] initializes roswell.
+The process includes the following steps:
+.IP \[bu] 2
+Downloading the default stable lisp implementation (sbcl\-bin) to
+\f[C]ROSWELL_INSTALL_DIR\f[].
+.IP \[bu] 2
+Installing quicklisp to \f[C]ROSWELL_INSTALL_DIR\f[].
+.IP \[bu] 2
+On Windows, install 7zip to \f[C]ROSWELL_INSTALL_DIR\f[].
+.IP \[bu] 2
+Making the core image of roswell itself.
 .SH SEE ALSO
 .PP
-\f[I]sbcl\f[](1) \f[I]ros\f[](1)
+\f[I]sbcl\f[](1), \f[I]ros\f[](1), section Environmental Variables
 .SH AUTHORS
 SANO Masatoshi.
diff --git a/documents/ros-setup.html b/documents/ros-setup.html
index 89c48b6..b52e58f 100644
--- a/documents/ros-setup.html
+++ b/documents/ros-setup.html
@@ -18,7 +18,7 @@
 <li class="author">SANO Masatoshi</li>
 </ul>
 </header>
-<p>ros-setup - install sbcl-bin and quicklisp</p>
+<p>ros-setup - setup the backend of roswell</p>
 <h1>Synopsis</h1>
 <p><strong>ros setup</strong></p>
 <!-- # subcommands -->
@@ -30,7 +30,13 @@
 
 
 <h1>Description</h1>
-<p>Runs some initial setup of roswell.</p>
+<p><strong>ros setup</strong> initializes roswell. The process includes the following steps:</p>
+<ul>
+<li>Downloading the default stable lisp implementation (sbcl-bin) to <code>ROSWELL_INSTALL_DIR</code>.</li>
+<li>Installing quicklisp to <code>ROSWELL_INSTALL_DIR</code>.</li>
+<li>On Windows, install 7zip to <code>ROSWELL_INSTALL_DIR</code>.</li>
+<li>Making the core image of roswell itself.</li>
+</ul>
 <!-- # options -->
 
 <!--  -->
@@ -39,6 +45,6 @@
 
 
 <h1>SEE ALSO</h1>
-<p><em>sbcl</em>(1) <em>ros</em>(1)</p>
+<p><em>sbcl</em>(1), <em>ros</em>(1), section Environmental Variables</p>
 </body>
 </html>
diff --git a/documents/ros-setup.md b/documents/ros-setup.md
index 5ed7eb3..8798d15 100644
--- a/documents/ros-setup.md
+++ b/documents/ros-setup.md
@@ -1,4 +1,4 @@
-ros-setup - install sbcl-bin and quicklisp
+ros-setup - setup the backend of roswell
 
 # Synopsis
 
@@ -11,12 +11,17 @@ ros-setup - install sbcl-bin and quicklisp
 
 # Description
 
-Runs some initial setup of roswell.
+**ros setup** initializes roswell. The process includes the following steps:
+
+* Downloading the default stable lisp implementation (sbcl-bin) to `ROSWELL_INSTALL_DIR`.
+* Installing quicklisp to `ROSWELL_INSTALL_DIR`.
+* On Windows, install 7zip to `ROSWELL_INSTALL_DIR`.
+* Making the core image of roswell itself.
 
 <!-- # options -->
 <!--  -->
 <!-- # Environmental Variables -->
 
 # SEE ALSO
-_sbcl_(1) _ros_(1)
+_sbcl_(1), _ros_(1), section Environmental Variables