Add original PR reference
@@ -4,7 +4,7 @@ mbed TLS ChangeLog (Sorted per branch, date)
Changes
* Optimize unnecessary zeroing in mbedtls_mpi_copy. Based on a contribution
- by Alexey Skalozub.
+ by Alexey Skalozub in #405.
= mbed TLS 2.7.0 branch released 2018-02-03
