diff --git a/doc/manual.html b/doc/manual.html
index 7db2afd..68dc923 100644
--- a/doc/manual.html
+++ b/doc/manual.html
@@ -386,6 +386,7 @@ gradient_id_pressed = 2
 <li><code>width</code> and <code>height</code> can be specified without units (e.g. <code>123</code>) as pixels, or followed by <code>%</code> as percentages of the monitor size (e.g. <code>50%</code>). Use <code>100%</code> for full monitor width/height.
 Example:</li>
 </ul></li>
+<li><p><code>scale_relative_to_dpi = integer</code> : If set to a non-zero value, HiDPI scaling is enabled. Each panel is visible on a different monitor. Thus each panel has a specific scaling factor. The scaling factor is computed as the ratio between the monitor DPI (obtained from the dimensions in pixels and millimeters from RandR) and a configured reference DPI - this is the DPI for which exising user configs looked normal, for backward compatibility.</p></li>
 </ul>
 <pre class="highlight plaintext"><code># The panel's width is 94% the size of the monitor, the height is 30 pixels:
 panel_size = 94% 30
diff --git a/doc/tint2.1 b/doc/tint2.1
index 466ac2f..11a04df 100644
--- a/doc/tint2.1
+++ b/doc/tint2.1
@@ -343,6 +343,8 @@ Use \fB\fCpanel_monitor = all\fR to get a separate panel per monitor
 \fB\fCwidth\fR and \fB\fCheight\fR can be specified without units (e.g. \fB\fC123\fR) as pixels, or followed by \fB\fC%\fR as percentages of the monitor size (e.g. \fB\fC50%\fR). Use \fB\fC100%\fR for full monitor width/height.
 Example:
 .RE
+.IP \(bu 2
+\fB\fCscale_relative_to_dpi = integer\fR : If set to a non\-zero value, HiDPI scaling is enabled. Each panel is visible on a different monitor. Thus each panel has a specific scaling factor. The scaling factor is computed as the ratio between the monitor DPI (obtained from the dimensions in pixels and millimeters from RandR) and a configured reference DPI \- this is the DPI for which exising user configs looked normal, for backward compatibility.
 .RE
 .PP
 .RS
diff --git a/doc/tint2.md b/doc/tint2.md
index 4a7fc36..732ae66 100644
--- a/doc/tint2.md
+++ b/doc/tint2.md
@@ -279,6 +279,8 @@ gradient_id_pressed = 2
     * `width` and `height` can be specified without units (e.g. `123`) as pixels, or followed by `%` as percentages of the monitor size (e.g. `50%`). Use `100%` for full monitor width/height.
       Example:
 
+  * `scale_relative_to_dpi = integer` : If set to a non-zero value, HiDPI scaling is enabled. Each panel is visible on a different monitor. Thus each panel has a specific scaling factor. The scaling factor is computed as the ratio between the monitor DPI (obtained from the dimensions in pixels and millimeters from RandR) and a configured reference DPI - this is the DPI for which exising user configs looked normal, for backward compatibility.
+
 ```
 # The panel's width is 94% the size of the monitor, the height is 30 pixels:
 panel_size = 94% 30