diff --git a/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.h b/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.h
index 1fc5d46935..7a9f26e680 100644
--- a/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.h
+++ b/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.h
@@ -26,6 +26,8 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath;
 
+@optional
+
 /**
  * Asks the inspector to provide a constrained size range for the given supplementary node.
  */
@@ -41,8 +43,6 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (NSUInteger)collectionView:(ASCollectionView *)collectionView supplementaryNodesOfKind:(NSString *)kind inSection:(NSUInteger)section;
 
-@optional
-
 /**
  * Allow the inspector to respond to delegate changes.
  *