diff --git a/documents/html/ros-list.html b/documents/html/ros-list.html
index 0332ccd..6e6fd9d 100644
--- a/documents/html/ros-list.html
+++ b/documents/html/ros-list.html
@@ -32,16 +32,23 @@
 <h1>Description</h1>
 <p><strong>ros list</strong> shows the list of the materials installed by roswell.</p>
 <dl>
-<dt>installed</dt>
-<dd><p>List implementations that already installed</p>
-</dd>
-<dt>dump</dt>
-<dd><p>List dumped</p>
-</dd>
-<dt>versions</dt>
-<dd><p>List installable versions(experimental)</p>
+<dt>installed [IMPL]</dt>
+<dd>List the implementations that have been already installed. Optionally
 </dd>
 </dl>
+<p>providing IMPL shows the installed versions of the implementation.</p>
+<dl>
+<dt>dump [IMPL]</dt>
+<dd>List the internal dumped images that are compatible with IMPL. When
+</dd>
+</dl>
+<p>IMPL is ommited, it is defaulted to the current lisp implementation in use. Images are in <code>$ROSWELL_INSTALL_DIR/impl/.../dump/</code>.</p>
+<dl>
+<dt>versions [IMPL]</dt>
+<dd>List the installable versions for IMPL. When IMPL is ommited, it is
+</dd>
+</dl>
+<p>defaulted to the current lisp implementation in use. This feature is experimental.</p>
 <!-- # options -->
 
 <!--  -->
diff --git a/documents/man/ros-list.1 b/documents/man/ros-list.1
index 13c9e20..7a0784f 100644
--- a/documents/man/ros-list.1
+++ b/documents/man/ros-list.1
@@ -9,20 +9,32 @@ ros\-list \- list the materials installed by roswell
 .PP
 \f[B]ros list\f[] shows the list of the materials installed by roswell.
 .TP
-.B installed
-List implementations that already installed
+.B installed [IMPL]
+List the implementations that have been already installed.
+Optionally
 .RS
 .RE
+.PP
+providing IMPL shows the installed versions of the implementation.
 .TP
-.B dump
-List dumped
+.B dump [IMPL]
+List the internal dumped images that are compatible with IMPL.
+When
 .RS
 .RE
+.PP
+IMPL is ommited, it is defaulted to the current lisp implementation in
+use.
+Images are in \f[C]$ROSWELL_INSTALL_DIR/impl/.../dump/\f[].
 .TP
-.B versions
-List installable versions(experimental)
+.B versions [IMPL]
+List the installable versions for IMPL.
+When IMPL is ommited, it is
 .RS
 .RE
+.PP
+defaulted to the current lisp implementation in use.
+This feature is experimental.
 .SH SEE ALSO
 .PP
 \f[I]sbcl\f[](1) \f[I]ros\f[](1)
diff --git a/documents/ros-list.md b/documents/ros-list.md
index 66deda7..64dbd75 100644
--- a/documents/ros-list.md
+++ b/documents/ros-list.md
@@ -13,17 +13,22 @@ ros-list - list the materials installed by roswell
 
 **ros list** shows the list of the materials installed by roswell.
 
-installed
+installed [IMPL]
 
-  : List implementations that already installed
+  : List the implementations that have been already installed. Optionally
+  providing IMPL shows the installed versions of the implementation.
 
-dump
+dump [IMPL]
 
-  : List dumped
+  : List the internal dumped images that are compatible with IMPL. When
+  IMPL is ommited, it is defaulted to the current lisp implementation in
+  use. Images are in `$ROSWELL_INSTALL_DIR/impl/.../dump/`.
 
-versions
+versions [IMPL]
 
-  : List installable versions(experimental)
+  : List the installable versions for IMPL. When IMPL is ommited, it is
+  defaulted to the current lisp implementation in use. This feature
+  is experimental.
 
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