diff --git a/R/footnote.R b/R/footnote.R
index 5e9201f..38a5e9c 100644
--- a/R/footnote.R
+++ b/R/footnote.R
@@ -26,7 +26,7 @@
 #' @param alphabet_title Section header for alphabet footnotes. Default is "".
 #' @param symbol_title Section header for symbol footnotes. Default is "".
 #'
-#' @examples x <- mtcars[1:5, 1:5]
+#' @examples dt <- mtcars[1:5, 1:5]
 #' footnote(knitr::kable(dt, "html"), alphabet = c("Note a", "Note b"))
 #'
 #' @export
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"))
diff --git a/man/footnote.Rd b/man/footnote.Rd
index 8cda4fc..6152876 100644
--- a/man/footnote.Rd
+++ b/man/footnote.Rd
@@ -50,7 +50,7 @@
 footnotes as a chunk of texts.
 }
 \examples{
-x <- mtcars[1:5, 1:5]
+dt <- mtcars[1:5, 1:5]
 footnote(knitr::kable(dt, "html"), alphabet = c("Note a", "Note b"))
 
 }
diff --git a/man/footnote_marker_number.Rd b/man/footnote_marker_number.Rd
index 1c3ba37..fece9f7 100644
--- a/man/footnote_marker_number.Rd
+++ b/man/footnote_marker_number.Rd
@@ -27,7 +27,7 @@
 \code{knitr.table.format}.
 }
 \examples{
-x <- mtcars[1:5, 1:5]
+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"))