diff --git a/forui/lib/src/theme/font.dart b/forui/lib/src/theme/font.dart
index a6abce456..c93cdaaf8 100644
--- a/forui/lib/src/theme/font.dart
+++ b/forui/lib/src/theme/font.dart
@@ -133,6 +133,7 @@ final class FFont with Diagnosticable {
 
   /// The font size for extra large text. Defaults to 72.
   ///
+  /// ## Contract:
   /// Throws an [AssertionError] if:
   /// * `xl7` <= 0.0
   /// * `xl7` is NaN