FAQ.md

 # Frequently Asked Questions
 
+- [Vertical Slides](
 - [Fragments](https://gitlab2.informatik.uni-wuerzburg.de/decker/decker/wikis/FAQ#how-do-i-create-fragments-elements-appearing-one-after-another)
 - [Columns](https://gitlab2.informatik.uni-wuerzburg.de/decker/decker/wikis/FAQ#how-do-i-create-columns)
 - [Speaker Notes](https://gitlab2.informatik.uni-wuerzburg.de/decker/decker/wikis/FAQ#how-do-i-create-speaker-notes)
 
 
+## Vertical Slides
+
+Currently to create vertical slides, you have to add `vertical-slides: true` to your `decker.yaml` file or the slide deck header. This requirement will be removed in the future and you will be able to create vertical slides without having to add this.
+
+Then you can add up to two layers of slides by adding `.sub` to a header
+
+```
+---
+vertical-slides: true
+---
+
+# First Slide
+
+Lorem Ipsum
+
+# Level 1 below {.sub}
+
+dolor sit amet
+
+# Level 2 below {.sub}
+
+consectetur adipiscing elit
+```
+
+
 ## How do I create fragments (elements appearing one after another)?
 
 - You can create blocks of content that appear only if you continue clicking by adding `.fragment` to them.
@@ -70,5 +96,4 @@ If you press the key `s` during a presentation, a speaker notes popup will open.
 Lorem Ipsum
 
 # Speaker Notes Slide {.notes}
-`
-``
+```