diff --git a/ChangeLog b/ChangeLog
index 0ead780090..839cefdd55 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -47,6 +47,8 @@ API Changes
      in favour a new generic error MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA.
    * Deprecate the Blowfish error MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
      in favour of a new generic error MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA.
+   * Add validation checks for input parameters to functions in the Cipher
+     module.
 
 New deprecations
    * Deprecate mbedtls_ctr_drbg_update and mbedtls_hmac_drbg_update