diff --git a/ChangeLog b/ChangeLog
index 134253d..c3d4efd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -30,6 +30,9 @@
      Discovered and fixed by Andy Gross (Linaro), #2392.
    * Zero length buffer check for undefined behavior in
      mbedtls_platform_zeroize(). Fixes ARMmbed/mbed-crypto#49.
+   * 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
    * Make it easier to define MBEDTLS_PARAM_FAILED as assert (which config.h