diff --git a/support/Release notes.txt b/support/Release notes.txt
index dad7b8381..a58e98a79 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -6,6 +6,7 @@ Added etl::bitset_ext
 Added etl::lsb_mask, etl::make_lsb_mask, etl::msb_mask and etl::make_msb_mask to binary utilities
 Updates for unordered maps and sets for an API that better matches the STL
 Fixes for etl::result<void, TError>
+Deleted copy constructors for etl::circular_buffer_ext, etl::indirect_vector_ext and etl::vector_ext to eliminate dangling pointers
 Fix non-C++03 code syntax
 Fixed unordered container equality tests to match STL
 #581 Hash function for enums