navigationMode documentation improvements

README.md

@@ -285,7 +285,7 @@ Reveal.initialize({
 	// Change the presentation direction to be RTL
 	rtl: false,
 
-	// .
+	// See https://github.com/hakimel/reveal.js/#navigation-mode
 	navigationMode: 'default',
 
 	// Randomizes the order of slides each time the presentation loads
@@ -522,13 +522,13 @@ Slides can be nested within other slides to create vertical stacks (see [Markup]
 <img src="https://static.slid.es/support/reveal.js-vertical-slides.gif" width="450">
 
 #### Navigation Mode
-You can finetune the reveal.js navigation behavior by using the `navigationMode` config option. This option supports the following values:
+You can finetune the reveal.js navigation behavior by using the `navigationMode` config option. Note that these options are only useful for presnetations that use a mix of horizontal and vertical slides. The following navigation modes are available:
 
 | Value                         | Description |
 | :---------------------------  | :---------- |
 | default                       | Left/right arrow keys step between horizontal slides. Up/down arrow keys step between vertical slides. Space key steps through all slides (both horizontal and vertical). |
 | linear                        | Removes the up/down arrows. Left/right arrows step through all slides (both horizontal and vertical). |
-| grid                          | When this is enabled, stepping left/right from a vertical stack to an adjacent vertical stack will land you at the same vertical index.<br><br>Consider a deck with six slides ordered in two vertical stacks:<br>1.1    2.1<br>1.2    2.2<br>1.3    2.3<br><br>If you're on slide 1.3 and navigate right, you will normally move from 1.3 -> 2.1. With navigationMode set to "grid" the same navigation takes you from 1.3 -> 2.3. |
+| grid                          | When this is enabled, stepping left/right from a vertical stack to an adjacent vertical stack will land you at the same vertical index.<br><br>Consider a deck with six slides ordered in two vertical stacks:<br>`1.1`&nbsp;&nbsp;&nbsp;&nbsp;`2.1`<br>`1.2`&nbsp;&nbsp;&nbsp;&nbsp;`2.2`<br>`1.3`&nbsp;&nbsp;&nbsp;&nbsp;`2.3`<br><br>If you're on slide 1.3 and navigate right, you will normally move from 1.3 -> 2.1. With navigationMode set to "grid" the same navigation takes you from 1.3 -> 2.3. |
 
 ### Touch Navigation