diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc605ae0eef83407c954bf9064a7f22df1f169c9..9e14f5f3e11afe059baa8afa2a96746ae7819d8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,9 @@ lemma.
   - `mono_nat_auth_frac_op`, `mono_nat_auth_frac_op_valid`,
     `mono_nat_auth_frac_valid`, `mono_nat_both_frac_valid`: use `dfrac` variant
     instead.
+* Add `mono_list` algebra for monotonically growing lists with an exclusive
+  authoritative element and persistent prefix witnesses. See
+  `iris/algebra/lib/mono_list.v` for details.
 
 **Changes in `bi`:**