diff --git a/README.Rmd b/README.Rmd
index 9418dbd..aecb0a8 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -182,6 +182,22 @@
 
 Decks with `slide_level: 1` (one `#` heading per slide) are left unnumbered -- there, headings denote slides, not chapters.
 
+The numbering can be turned off with the `chapter_numbering` option -- headings then keep exactly what was typed:
+
+``` yaml
+output:
+  revealjs.ids::revealjs_presentation:
+    chapter_numbering: false
+```
+
+A number starts the enumeration at that value instead, which is useful for continuation decks:
+
+``` yaml
+output:
+  revealjs.ids::revealjs_presentation:
+    chapter_numbering: 5
+```
+
 ## 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.