diff --git a/docs/docs/api.xml b/docs/docs/api.xml
index b6616db5a..d2c8ab655 100644
--- a/docs/docs/api.xml
+++ b/docs/docs/api.xml
@@ -1228,6 +1228,9 @@
                   <td><a href="dlib/gui_widgets/widgets_abstract.h.html#open_file_box"><img src="guipics/open_file_box.png"/></a></td>
                   <td><a href="dlib/gui_widgets/widgets_abstract.h.html#save_file_box"><img src="guipics/save_file_box.png"/></a></td>
                </tr>
+               <tr>
+                  <td colspan='3'><a href="dlib/gui_widgets/widgets_abstract.h.html#perspective_window"><img src="guipics/perspective_window.png"/></a></td>
+               </tr>
             </table>
 
          </description>
@@ -1235,6 +1238,7 @@
          <examples>
             <example>gui_api_ex.cpp.html</example>
             <example>image_ex.cpp.html</example>
+            <example>3d_point_cloud_ex.cpp.html</example>
             <example>surf_ex.cpp.html</example>
             <example>bayes_net_gui_ex.cpp.html</example>
          </examples>
diff --git a/docs/docs/guipics/perspective_window.png b/docs/docs/guipics/perspective_window.png
new file mode 100644
index 000000000..13c01f2e2
Binary files /dev/null and b/docs/docs/guipics/perspective_window.png differ
diff --git a/docs/docs/main_menu.xml b/docs/docs/main_menu.xml
index 2695813ea..5a70ce989 100644
--- a/docs/docs/main_menu.xml
+++ b/docs/docs/main_menu.xml
@@ -302,6 +302,10 @@
                   <name>Matrix_Expressions</name>
                   <link>matrix_expressions_ex.cpp.html</link>
                </item>
+               <item>
+                  <name>3D_Point_Cloud</name>
+                  <link>3d_point_cloud_ex.cpp.html</link>
+               </item>
                <item>
                   <name>Image</name>
                   <link>image_ex.cpp.html</link>
diff --git a/docs/docs/stylesheet.xsl b/docs/docs/stylesheet.xsl
index ff2ae7be7..b90f4e1af 100644
--- a/docs/docs/stylesheet.xsl
+++ b/docs/docs/stylesheet.xsl
@@ -923,9 +923,16 @@ function BigToggle(node)
        </xsl:if>
    </xsl:template>   
    <xsl:template match="td">
-      <td align="center">
-         <xsl:apply-templates/>
-       </td>
+      <xsl:if test="@colspan">
+         <td align="center" colspan="{@colspan}">
+            <xsl:apply-templates/>
+         </td>
+      </xsl:if>
+      <xsl:if test="not(@colspan)">
+         <td align="center">
+            <xsl:apply-templates/>
+         </td>
+      </xsl:if>
    </xsl:template>   
    <xsl:template match="tr">
       <tr>