diff --git a/R/bootstrap-layout.R b/R/bootstrap-layout.R
index bafa553f2..3635c5a09 100644
--- a/R/bootstrap-layout.R
+++ b/R/bootstrap-layout.R
@@ -309,7 +309,7 @@ verticalLayout <- function(..., fluid = TRUE) {
 #' Lays out elements in a left-to-right, top-to-bottom arrangement. The elements
 #' on a given row will be top-aligned with each other. This layout will not work
 #' well with elements that have a percentage-based width (e.g. `plotOutput` at
-#' its default setting of `width = "100%"`).
+#' its default setting of `width = "100\%"`).
 #'
 #' @param ... Unnamed arguments will become child elements of the layout. Named
 #'   arguments will become HTML attributes on the outermost tag.