diff --git a/ChangeLog b/ChangeLog
index 58ff147..e429caf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -33,6 +33,9 @@
      for the parameter.
    * Add a check for MBEDTLS_X509_CRL_PARSE_C in ssl_server2, guarding the crl
      sni entry parameter. Reported by inestlerode in #560.
+   * Fix bug in endianness conversion in bignum module. This lead to
+     functionally incorrect code on bigendian systems which don't have
+     __BYTE_ORDER__ defined. Reported by Brendan Shanks. Fixes #2622.
 
 Changes
    * Server's RSA certificate in certs.c was SHA-1 signed. In the default