diff --git a/CHANGES.md b/CHANGES.md
index 11e707e5f..ad9c6c8e2 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,6 +11,8 @@
 
 - Improved HEXL NTT integration [(PR 349)](https://github.com/microsoft/SEAL/pull/349).
 - Improved CKKS ciphertext multiplication [(PR 346)](https://github.com/microsoft/SEAL/pull/346).
+- Improved CKKS ciphertext square [(PR 353)](https://github.com/microsoft/SEAL/pull/353), except that with GNU G++ compiler and `1024` degree there is a huge penalty in execution time.
+Users should switch from GNU G++ in this specific parameter setting if CKKS square is used.
 
 ## Version 3.6.5