diff --git a/python/zensical/config.py b/python/zensical/config.py
index 984ab85..5768743 100644
--- a/python/zensical/config.py
+++ b/python/zensical/config.py
@@ -379,6 +379,7 @@ def _apply_defaults(config: dict, path: str) -> dict:
                 "md_in_html": {},
                 "toc": {"permalink": True},
                 "pymdownx.arithmatex": {"generic": True},
+                "pymdownx.betterem": {},
                 "pymdownx.caret": {},
                 "pymdownx.details": {},
                 "pymdownx.emoji": {