diff --git a/Frequently-Asked-Questions.md b/Frequently-Asked-Questions.md
index 3427a57..7713786 100644
--- a/Frequently-Asked-Questions.md
+++ b/Frequently-Asked-Questions.md
@@ -113,6 +113,13 @@ User interface buttons or <kbd>ctrl</kbd> + mouse wheel can be used to change th
 
 (replace ctrl with meta on some configurations)
 
+### Outline sidebar
+
+- After showing the sidebar, click on the "Show document outline" button (![Show document outline](https://mozilla.github.io/pdf.js/web/images/toolbarButton-viewOutline.png)) to show the document outline (if the PDF file has one).
+- Nested outline items can be expanded/collapsed by clicking on the triangles at the left of an item.
+- To expand/collapse all items under the selected item, press <kbd>Shift</kbd> while clicking on the triangle.
+- Double-click on the "Show document outline" button (![Show document outline](https://mozilla.github.io/pdf.js/web/images/toolbarButton-viewOutline.png)) to expand/collapse all outline items.
+
 <a name="minified"></a>
 ## The PDF.js files are too big. Can you provide minified versions of JS files?