diff --git a/CHANGELOG b/CHANGELOG
index 372a59d58..4b76986f3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -5,6 +5,14 @@ List of major changes and improvements between releases
 Yosys 0.63 .. Yosys 0.64-dev
 --------------------------
 
+ * Various
+    - Removed rarely-used options from ABC/ABC9.
+       - Calls to "abc -g AND -fast" to map logic to
+         AND-Inverter Graph form should be replaced with
+         "aigmap".
+       - The above change was made to SBY, so we recommend
+         updating it.
+
 Yosys 0.62 .. Yosys 0.63
 --------------------------
  * Various