diff --git a/CHANGELOG.md b/CHANGELOG.md
index 712c4b8a2ab92ff96387d676d4c5c6c72cc8291a..69fba630e5120ab7addc36aab116f68ed0c224d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ Coq 8.11 is no longer supported.
 - Rename "unsealing" lemmas from `_eq` to `_unseal`. This affects `ndot_eq` and
   `nclose_eq`. These unsealing lemmas are internal, so in principle you should
   not rely on them.
+- Declare hint mode for `FinSet A C` so that `C` is input, and `A` is output
+  (i.e., inferred from `C`).
 
 ## std++ 1.7.0 (2022-01-22)