diff --git a/doc/teacherview-studyplan.htm b/doc/teacherview-studyplan.htm
index 59a8134..02563e5 100644
--- a/doc/teacherview-studyplan.htm
+++ b/doc/teacherview-studyplan.htm
@@ -25,7 +25,7 @@
     <p> The view shows info cards for each studyplans in relevant order: Current (blue), Past (purple) and  Future (grey), with colored bars indicating the timing status</p>
     <p> By clicking the info card's title or <b>open</b> button, the study plan is shown in detail (statistics view)</p>
     <div class="generalbox alert alert-success"><b>TIP:</b><br>
-        <p>The colors can be tweaked by changing the boostrap CSS vars <i>--blue</i>, <i>--purple</i> and <i>--gray</i></p>
+        <p>The colors can be tweaked by changing the  CSS vars <i>--past</i>, <i>--present</i> and <i>--future</i></p>
         <p>These same colors are also used to indicate the timing status of courses in the studyplan view itself</p>
     </div>