diff --git a/ChangeLog b/ChangeLog
index 44533d2..f56859e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -18,6 +18,9 @@
      return value. Found by @davidwu2000. #839
    * Fix a memory leak in mbedtls_x509_csr_parse(), found by catenacyber,
      Philippe Antoine. Fixes #1623.
+   * Change the default behaviour of mbedtls_hkdf_extract() to return an error
+     when calling with a NULL salt and non-zero salt_len. Contributed by
+     Brian J Murray
 
 Changes
    * Change the shebang line in Perl scripts to look up perl in the PATH.