update to roxygen2 6.0 + markdown
diff --git a/R/revealjs_presentation.R b/R/revealjs_presentation.R
index 9399e47..f486044 100644
--- a/R/revealjs_presentation.R
+++ b/R/revealjs_presentation.R
@@ -7,29 +7,32 @@
#' @inheritParams rmarkdown::html_document
#'
#' @param center \code{TRUE} to vertically center content on slides
-#' @param slide_level Level of heading to denote individual slides. If
-#' \code{slide_level} is 2 (the default), a two-dimensional layout will be
-#' produced, with level 1 headers building horizontally and level 2 headers
-#' building vertically. It is not recommended that you use deeper nesting of
+#' @param slide_level Level of heading to denote individual slides. If
+#' \code{slide_level} is 2 (the default), a two-dimensional layout will be
+#' produced, with level 1 headers building horizontally and level 2 headers
+#' building vertically. It is not recommended that you use deeper nesting of
#' section levels with reveal.js.
-#' @param theme Visual theme ("simple", "sky", "beige", "serif", "solarized",
+#' @param theme Visual theme ("simple", "sky", "beige", "serif", "solarized",
#' "blood", "moon", "night", "black", "league" or "white").
#' @param transition Slide transition ("default", "none", "fade", "slide",
#' "convex", "concave" or "zoom")
-#' @param background_transition Slide background-transition ("default", "none",
+#' @param background_transition Slide background-transition ("default", "none",
#' "fade", "slide", "convex", "concave" or "zoom")
#' @param reveal_options Additional options to specify for reveal.js (see
#' \href{https://github.com/hakimel/reveal.js#configuration}{https://github.com/hakimel/reveal.js#configuration}
-#' for details).
-#' @param reveal_plugins Reveal plugins to include. Available plugins include "notes",
-#' "search", and "zoom". Note that \code{self_contained} must be set to
-#' \code{FALSE} in order to use Reveal plugins.
-#' @param template Pandoc template to use for rendering. Pass "default" to use
-#' the rmarkdown package default template; pass \code{NULL} to use pandoc's
-#' built-in template; pass a path to use a custom template that you've
-#' created. Note that if you don't use the "default" template then some
-#' features of \code{revealjs_presentation} won't be available (see the
+#' for details).
+#' @param reveal_plugins Reveal plugins to include. Available plugins include
+#' "notes", "search", "zoom", and "chalkboard". Note that
+#' \code{self_contained} must be set to \code{FALSE} in order to use Reveal
+#' plugins.
+#' @param template Pandoc template to use for rendering. Pass "default" to use
+#' the rmarkdown package default template; pass \code{NULL} to use pandoc's
+#' built-in template; pass a path to use a custom template that you've
+#' created. Note that if you don't use the "default" template then some
+#' features of \code{revealjs_presentation} won't be available (see the
#' Templates section below for more details).
+#' @param extra_dependencies Additional function arguments to pass to the base R
+#' Markdown HTML output formatter [rmarkdown::html_document_base()].
#' @param ... Ignored
#'
#' @return R Markdown output format to pass to \code{\link{render}}
@@ -38,12 +41,12 @@
#'
#' In reveal.js presentations you can use level 1 or level 2 headers for slides.
#' If you use a mix of level 1 and level 2 headers then a two-dimensional layout
-#' will be produced, with level 1 headers building horizontally and level 2
+#' will be produced, with level 1 headers building horizontally and level 2
#' headers building vertically.
#'
-#' For additional documentation on using revealjs presentations see
+#' For additional documentation on using revealjs presentations see
#' \href{https://github.com/rstudio/revealjs}{https://github.com/rstudio/revealjs}.
-#'
+#'
#' @examples
#' \dontrun{
#'