diff --git a/README.md b/README.md
index cbcee1e..00d7799 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@ Project is provided under Mit license which you can find in inner main folder ("
 
 Known limitations.
 - Custom property drawer has no effect. Becouse property is drawn from custom attribute drawer custom property drawer is not applied (unity default behaviour).
+- Can not serialized types derived from UnityEngine.Object (monbehaviour, scriptableObject) (unity's limitation).
+- Can not create instance of object that does not have empty constructor.
 
 Known Issues of serialized reference: 
 - Renaming used type can produce data loss and throws unknown managed type exception. This is unity's bug.