Read rmarkdown format from metadata: rmd_format
diff --git a/R/footnote.R b/R/footnote.R
index d849779..7b0c4ec 100644
--- a/R/footnote.R
+++ b/R/footnote.R
@@ -38,9 +38,9 @@
     symbol.html = c(
       "*", "†", "‡", "§", "¶",
       "**", "††", "‡‡", "§§", "¶¶",
-      "*", "†††", "‡‡‡",
+      "***", "†††", "‡‡‡",
       "§§§", "¶¶¶",
-      "**", "††††", "‡‡‡‡",
+      "****", "††††", "‡‡‡‡",
       "§§§§", "¶¶¶¶"
     ),
     symbol.markdown = c(