Reduce the timing tests complexity
diff --git a/ChangeLog b/ChangeLog
index b39b953..780e793 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,10 @@
    * Add `MBEDTLS_SELF_TEST` for the mbedtls_self_test functions
      in the header files, which missed the precompilation check. #971
 
+Changes
+   * Reduced the complexity of the timing tests, as they were failing in less
+     reliable environments.
+
 = mbed TLS 2.16.0 branch released 2018-12-21
 
 Features