diff --git a/feed/history/boost_1_80_0.qbk b/feed/history/boost_1_80_0.qbk
index a6b39ee6..ed14c5f9 100644
--- a/feed/history/boost_1_80_0.qbk
+++ b/feed/history/boost_1_80_0.qbk
@@ -177,6 +177,11 @@ Please keep the list of libraries sorted in lexicographical order.
   * `basic_filebuf`: Fix wrong return value of `sync` when `fflush` failed
   * `basic_filebuf`: Fix possible undefined behavior in a corner case when nothing was actually written but buffer is in "write" mode
   * `basic_filebuf`: Limit putback of characters (i.e. `pbackfail`) only allowing putback of buffered characters (may be only 1 character)
+  
+* [phrase library..[@/libs/optional/ Optional]:]
+  * Added specializations for `std::hash<boost::optional<T>>`. 
+    This is a breaking change for programs that define such specializations themselves. 
+    For more details see [@/libs/optional/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___std__hash_specializations.html#reference_std_hash_spec specs].
 
 * [phrase library..[@/libs/stl_interfaces/ STLInterfaces]:]
   * Fix [github stl_interfaces 53]: "missing 'typename' prior to dependent type