diff --git a/R/layout-align.R b/R/layout-align.R
index fde35eb9..50607ca3 100644
--- a/R/layout-align.R
+++ b/R/layout-align.R
@@ -13,6 +13,7 @@
 #' @param x,y Same as `...`, but specifically for `quad_layout()`.
 #'
 #' @importFrom rlang list2
+#' @keywords internal
 layout_expand <- function(..., x = waiver(), y = waiver()) {
     if (...length() > 0L && (!is.waive(x) || !is.waive(y))) {
         cli_abort(
diff --git a/man/layout_expand.Rd b/man/layout_expand.Rd
index 5643ccf1..fe0409bf 100644
--- a/man/layout_expand.Rd
+++ b/man/layout_expand.Rd
@@ -20,3 +20,4 @@ plots in the layout. You can add a \code{layout_expand} object to the layout. Fo
 the \code{quad_layout()} function, you must specify \code{x} and \code{y} arguments. For
 other layouts, you can pass the expansion values using \code{...} directly.
 }
+\keyword{internal}