diff --git a/web_timeline/static/description/index.html b/web_timeline/static/description/index.html
index 72c24f649..93b1494f6 100644
--- a/web_timeline/static/description/index.html
+++ b/web_timeline/static/description/index.html
@@ -449,6 +449,10 @@ the possible attributes for the tag:</p>
 <td>No</td>
 <td>Allows to set certain specific colors if the expressed condition (JS syntax) is met.</td>
 </tr>
+<tr><td>color-field</td>
+<td>No</td>
+<td>Allows to set a field (on the current model) that contains the HTML color (e.g. #FFFFFF). This option has priority over ‘colors’.</td>
+</tr>
 <tr><td>dependency_arrow</td>
 <td>No</td>
 <td>Set this attribute to a x2many field to draw arrows between the records referenced in the x2many field.</td>