diff --git a/docs/_docs/configuration.md b/docs/_docs/configuration.md
index 3f3bfd25..79de5a98 100644
--- a/docs/_docs/configuration.md
+++ b/docs/_docs/configuration.md
@@ -653,7 +653,6 @@ redcarpet:
 
 kramdown:
   auto_ids:       true
-  footnote_nr:    1
   entity_output:  as_char
   toc_levels:     1..6
   smart_quotes:   lsquo,rsquo,ldquo,rdquo