adding none to add_footnote
diff --git a/man/add_footnote.Rd b/man/add_footnote.Rd
index 46ab96e..79eff3b 100644
--- a/man/add_footnote.Rd
+++ b/man/add_footnote.Rd
@@ -15,7 +15,7 @@
notations in your notes.}
\item{notation}{You can select the format of your footnote notation from
-\code{number}, \code{alphabet} and \code{symbol}.}
+\code{number}, \code{alphabet}, \code{symbol} and \code{none}.}
\item{threeparttable}{Boolean value indicating if a
\href{https://www.ctan.org/pkg/threeparttable}{threeparttable} scheme should