update footnote doc; fix a bug in row_spec
diff --git a/man/footnote_marker_number.Rd b/man/footnote_marker_number.Rd
index c16664c..1c3ba37 100644
--- a/man/footnote_marker_number.Rd
+++ b/man/footnote_marker_number.Rd
@@ -26,3 +26,10 @@
\code{format} option here can read default value from global option
\code{knitr.table.format}.
}
+\examples{
+x <- 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"))
+
+}