diff --git a/ChangeLog b/ChangeLog
index 348864c0e..093b3a80b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -13,6 +13,10 @@ API Changes
      Therefore, mbedtls_platform_zeroize() is moved to the platform module to
      facilitate testing and maintenance.
 
+Bugfix
+   * Fix an issue with MicroBlaze support in bn_mul.h which was causing the
+     build to fail. Found by zv-io. Fixes #1651.
+
 = mbed TLS 2.9.0 branch released 2018-04-30
 
 Security