diff --git a/RELEASES.md b/RELEASES.md
index 0d11dc53fd..f759b37272 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -82,7 +82,7 @@ Samuel Debionne, Thiago Henrique Hüpner, Pranam Lashkari, Mateusz Loskot, Debab
 - Move all tests, core features and extensions, inside `test/` directory ([PR #302](https://github.com/boostorg/gil/pull/302)).
 
 ### Removed
-- Replace Boost.MPL with Boost.MP11 ([PR #274](https://github.com/boostorg/gil/pull/274)).
+- BREAKING: Replace Boost.MPL with Boost.MP11 ([PR #274](https://github.com/boostorg/gil/pull/274)).
 - Removed use of Boost.TypeTraits ([PR #274](https://github.com/boostorg/gil/pull/274)).
 - Dropped support for GCC <= 4.8 ([PR #296](https://github.com/boostorg/gil/pull/296)).
 - Remove `include/boost/gil/version.hpp` file as unused ([PR #403](https://github.com/boostorg/gil/pull/403)).
@@ -148,7 +148,7 @@ Mateusz Loskot, Marcel Metz, Stefan Seefeld
 ## [1.68.0] - 2018-08-09
 
 ### Added
-- The library now requires a C++11-compliant compiler.
+- BREAKING: The library now requires a C++11-compliant compiler.
 - New top-level all-in-one `include/boost/gil.hpp` header.
 - Added Toolbox extension following the [review and acceptance into Boost](https://lists.boost.org/boost-announce/2011/01/0281.php).