diff --git a/man/revealjs_presentation.Rd b/man/revealjs_presentation.Rd
index c1c1ff2..ba10ef0 100644
--- a/man/revealjs_presentation.Rd
+++ b/man/revealjs_presentation.Rd
@@ -178,6 +178,46 @@
 to create notes only viewable in presentation mode.
 }
 
+}
+
+\subsection{Slide timing}{
+
+Speaker time can be planned per slide and per speaker by adding a comment
+with a speaker code and the expected duration (in \code{MM:SS}, \code{HH:MM:SS}, or
+plain seconds format) anywhere inside a slide:
+
+\if{html}{\out{<div class="sourceCode markdown">}}\preformatted{## My slide title
+
+Some content
+
+<!-- MK 00:30 -->
+}\if{html}{\out{</div>}}
+
+This means Marc Kupietz will need 30 seconds for that slide. For talks
+presented by a single speaker, the speaker code can be omitted:
+\verb{<!-- 00:30 -->}.
+
+Typically you start from a known total time budget and adjust the
+individual slides to it. You can set this budget yourself with the
+reveal.js \code{totalTime} option (in seconds):
+
+\if{html}{\out{<div class="sourceCode yaml">}}\preformatted{output:
+  revealjs.ids::revealjs_presentation:
+    reveal_options:
+      totalTime: 3600 # one hour
+}\if{html}{\out{</div>}}
+
+During rendering, comments are converted into \code{data-timing} attributes on
+the slides' \verb{<section>} elements (several speakers per slide are summed
+up), and the calculated grand total is passed to reveal.js as the
+\code{totalTime} config value. This activates the pacing timer in the
+\href{https://revealjs.com/speaker-view/}{speaker view}, which shows how you
+are doing relative to your plan. A summary of the total time per speaker
+is printed during rendering. If the document sets \code{totalTime} or
+\code{defaultTiming} itself (via \code{reveal_options}), those take precedence.
+
+The function \code{\link[=slide_timing]{slide_timing()}} computes these totals directly from an
+\code{.Rmd} source file without rendering it.
 \subsection{Search}{
 
 When opt-in, it is possible to show a search box when pressing \code{CTRL + SHIFT + F}. It will seach in the whole presentation, and highlight matched words. The