add support for the chalkboard plugin
diff --git a/man/revealjs_presentation.Rd b/man/revealjs_presentation.Rd
index d29c7b1..3845cd7 100644
--- a/man/revealjs_presentation.Rd
+++ b/man/revealjs_presentation.Rd
@@ -11,7 +11,7 @@
   background_transition = "default", reveal_options = NULL,
   reveal_plugins = NULL, highlight = "default", mathjax = "default",
   template = "default", css = NULL, includes = NULL, keep_md = FALSE,
-  lib_dir = NULL, pandoc_args = NULL, ...)
+  lib_dir = NULL, pandoc_args = NULL, extra_dependencies = NULL, ...)
 }
 \arguments{
 \item{incremental}{\code{TRUE} to render slide bullets incrementally. Note
@@ -95,6 +95,9 @@
 
 \item{pandoc_args}{Additional command line options to pass to pandoc}
 
+\item{extra_dependencies}{Add \code{latex_dependency()} dependencies. It can
+can be used to add custom LaTeX packages to the .tex header.}
+
 \item{...}{Ignored}
 }
 \value{