diff --git a/CHANGELOG.md b/CHANGELOG.md
index b450f49..2edb1ae 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,3 +2,5 @@
 
 - Allow `base-4.11`
 - Add `Semigroup Element` instance
+
+- r1 (10 Oct 2018): allow `base-4.12`