fix example
diff --git a/R/footnote_marker.R b/R/footnote_marker.R
index beb1c4e..1f0e6eb 100644
--- a/R/footnote_marker.R
+++ b/R/footnote_marker.R
@@ -11,7 +11,7 @@
#' @param format Either `html` or `latex`. All functions here can read
#' default value from global option `knitr.table.format`.
#'
-#' @examples x <- mtcars[1:5, 1:5]
+#' @examples dt <- mtcars[1:5, 1:5]
#' colnames(dt)[1] <- paste0("mpg", footnote_marker_alphabet(2, "html"))
#' rownames(dt)[2] <- paste0(rownames(dt)[2], footnote_marker_alphabet(1, "html"))
#' footnote(knitr::kable(dt, "html"), alphabet = c("Note a", "Note b"))