diff --git a/README.Rmd b/README.Rmd
index a4b6e88..9418dbd 100644
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+++ b/README.Rmd
@@ -182,6 +182,10 @@
 
 Decks with `slide_level: 1` (one `#` heading per slide) are left unnumbered -- there, headings denote slides, not chapters.
 
+## Vertical Content Centering
+
+Slides with little content no longer sit glued below the title bar: whenever there is free space, the slide's body content is centered in the area between the heading and the footer. Slides that are too packed start directly below the heading and overflow downwards exactly as before, and centered content never covers the footer. Reveal.js' own `center` option could not be used for this, because it also vertically centers the headings. Heading-only section-divider slides keep their dedicated centered-title layout.
+
 ## Incremental Bullets
 
 You can render bullets incrementally by adding the `incremental` option: