Document guide theme argument

R/guide-axis.R

@@ -6,6 +6,9 @@
 #' [scale_(x|y)_discrete()][scale_x_discrete()].
 #'
 #' @inheritParams guide_legend
+#' @param theme A [`theme`][theme()] object to style the guide individually or
+#'   differently from the plot's theme settings. The `theme` argument in the
+#'   guide partially overrides, and is combined with, the plot's theme.
 #' @param check.overlap silently remove overlapping labels,
 #'   (recursively) prioritizing the first, last, and middle labels.
 #' @param angle Compared to setting the angle in [theme()] / [element_text()],

R/guide-legend.R

@@ -15,7 +15,11 @@
 #'   specified in [labs()] is used for the title.
 #' @param theme A [`theme`][theme()] object to style the guide individually or
 #'   differently from the plot's theme settings. The `theme` argument in the
-#'   guide overrides, and is combined with, the plot's theme.
+#'   guide partially overrides, and is combined with, the plot's theme.
+#'   Arguments that apply to a single legend are respected, most of which have
+#'   the `legend`-prefix. Arguments that apply to combined legends
+#'   (the legend box) are ignored, including `legend.position`,
+#'   `legend.justification.*`, `legend.location` and `legend.box.*`.
 #' @param position A character string indicating where the legend should be
 #'   placed relative to the plot panels.
 #' @param direction  A character string indicating the direction of the guide.