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@@ -132,6 +132,10 @@ OCaml 5.1.0
   (B. Szilvasy, Gabriel Scherer and Xavier Leroy, review by
    Stefan Muenzel, Guillaume Munch-Maccagnoni and Damien Doligez)
 
+- #12131: Simplify implementation of weak hash sets, fixing a
+  performance regression. (Nick Barnes, review by François Bobot,
+  Alain Frisch and Damien Doligez).
+
 ### Type system:
 
 - #6941, #11187: prohibit using classes through recursive modules