diff --git a/MVMCore/MVMCore/Categories/NSArray+MFConvenience.h b/MVMCore/MVMCore/Categories/NSArray+MFConvenience.h
index 9459b1a..481c332 100644
--- a/MVMCore/MVMCore/Categories/NSArray+MFConvenience.h
+++ b/MVMCore/MVMCore/Categories/NSArray+MFConvenience.h
@@ -40,7 +40,7 @@
 // Maps this array to a new array of T objects given a conversion block. Objective-C implementation of Swift's map. https://developer.apple.com/documentation/swift/array/2908681-map
 - (nonnull NSArray *)map:(id _Nullable (^_Nonnull)(id _Nonnull obj))mapBlock;
 - (nonnull NSArray *)filter:(BOOL (^_Nullable)(id _Nonnull obj))block;
-- (nonnull id)reduce:(nonnull id)initial block:(id (^_Nullable)(id _Nonnull obj1, id obj2))block;
-- (NSArray *_Nullable)flatMap:(id (^_Nonnull)(id obj))block;
+- (nonnull id)reduce:(id _Nonnull)initial block:(id _Nonnull (^_Nonnull)(id _Nonnull obj1,id _Nonnull obj2))block;
+- (nullable NSArray *)flatMap:(id _Nullable (^_Nonnull)(id _Nullable obj))block;
 
 @end