add collapse_rows html
diff --git a/man/row_spec.Rd b/man/row_spec.Rd
index 169c05a..deb7912 100644
--- a/man/row_spec.Rd
+++ b/man/row_spec.Rd
@@ -9,7 +9,8 @@
\arguments{
\item{kable_input}{Output of `knitr::kable()` with `format` specified}
-\item{row}{A numeric value indicating which row to be selected}
+\item{row}{A numeric value indicating which row to be selected. You don't
+need to count in header rows or group labeling rows.}
\item{bold}{A T/F value to control whether the text of the selected row
need to be bolded.}