diff --git a/support/Release notes.txt b/support/Release notes.txt
index 2d8b7777..3e58b107 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -11,6 +11,7 @@
 #698 Behaviour of bidirectional_link nodes. Links are now cleared when unlinked
 #699 Optional(POD) operator bool explicit
 Optimised map/flat_map/unordered_map [] operator and insert()
+Removed [] operator for reference_flat_map
 Unit tests compile for C++11
 Fixed C++11 constexpr compatibility
 Removed redundant 'const' in template parameters