diff --git a/CHANGES.md b/CHANGES.md
index e492604..5118709 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+# 1.2.1
+
+- Convert from Jbuilder to Dune (#5).
+
 # 1.2
 
 - Fix copyright year