diff --git a/widgetlib/textutil.py b/widgetlib/textutil.py
index 09e3f8e..5e1bc63 100644
--- a/widgetlib/textutil.py
+++ b/widgetlib/textutil.py
@@ -14,7 +14,7 @@ def slugify(title: str) -> str:
     hyphens are stripped.
     """
     slug = _NON_ALNUM.sub("-", title).strip("-")
-    return slug
+    return slug.lower()
 
 
 def truncate(text: str, limit: int) -> str:
