diff --git a/CHANGELOG.md b/CHANGELOG.md
index aff5d2f3f046f1c2f0702d843251c4b71765c5e4..ed9e0739fb358bfac0e12ddd72205e3621a75816 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,9 @@ Changes in and extensions of the theory:
 Changes in Coq:
 
 * Rename `timelessP` -> `timeless` (projection of the `Timeless` class)
+* The CMRA axiom `cmra_extend` is now stated in `Type`, using `sigT` instead
+  of in `Prop` using `exists`. This makes it possible to define the functionnal
+  CMRA even for an infinite domain.
 
 ## Iris 3.1.0 (released 2017-12-19)