diff --git a/docs/NativeModulesIOS.md b/docs/NativeModulesIOS.md
index ce1bf2e86..41266aad7 100644
--- a/docs/NativeModulesIOS.md
+++ b/docs/NativeModulesIOS.md
@@ -374,7 +374,7 @@ Then create a private implementation file that will register the required inform
 
 @interface RCT_EXTERN_MODULE(CalendarManager, NSObject)
 
-RCT_EXTERN_METHOD(addEvent:(NSString *)name location:(NSString *)location date:(NSNumber *)date)
+RCT_EXTERN_METHOD(addEvent:(NSString *)name location:(NSString *)location date:(nonnull NSNumber *)date)
 
 @end
 ```