Update README.md

Ritsuka314 · web-flow · commit f0486d9c278e · 2023-05-10T11:38:50.000-04:00
diff --git a/README.md b/README.md
@@ -47,13 +47,15 @@ You can pass additional arguments to pandoc through `_config.yml`. The default c
 
 ```yml
 pandoc:
+  extensions:
   filters:
   extra:
   template:
   meta:
   mathEngine:
 ```
 
+* `extensions` is a list of [markdown extensions](https://pandoc.org/MANUAL.html#extensions)
 * `filters` is a list of any pandoc filter installed on your path.
 * `extra` is a list of mappings:
 
