diff --git a/ChangeLog b/ChangeLog
index ebf8a36ad..9cffd5d5e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -488,6 +488,9 @@ New deprecations
      deprecated.
    * PSA_ALG_AEAD_WITH_DEFAULT_TAG_LENGTH and PSA_ALG_AEAD_WITH_TAG_LENGTH
      have been renamed, and the old names deprecated.
+   * Signed magnitude and one's complement implementations for signed integers are
+     are now officially not supported. Two's Complement is the only supported
+     implementation going forward.
 
 Features
    * The PSA crypto subsystem can now use HMAC_DRBG instead of CTR_DRBG.