diff --git a/README.md b/README.md
index a814604e..c76a1d50 100644
--- a/README.md
+++ b/README.md
@@ -64,4 +64,5 @@ do not combine the commands because they can not be executed at the same time.
 
 ## Current Down Sides (Random order)
 - Testing for Sub Maps/Sets/Lists are only in a very basic way tested
-- Documentation is only present at the lowest level for most cases and needs a typo fixing.
\ No newline at end of file
+- Documentation is only present at the lowest level for most cases and needs a typo fixing.
+- ToString method in Wrapper Classes do not work correctly. (Synchronized/Unmodifiable wrappers)
\ No newline at end of file