diff --git a/mkdocs.yml b/mkdocs.yml
index 53a34743..2782e231 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -76,6 +76,7 @@ markdown_extensions:
   - attr_list
   - def_list
   - md_in_html
+  - footnotes
   - pymdownx.betterem
   - pymdownx.caret
   - pymdownx.mark