Add changelog entry for ECC hardware bugfix
diff --git a/ChangeLog b/ChangeLog
index 3f23854..ef3c63b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -35,6 +35,10 @@
    * Deprecate mbedtls_ctr_drbg_update and mbedtls_hmac_drbg_update
      in favor of functions that can return an error code.
 
+Bugfix
+   * Fix double initialization of ECC hardware that made some accelerators
+     hang.
+
 = mbed TLS 2.14.0 branch released 2018-11-19
 
 Security