Add option for even smaller SHA-256
diff --git a/ChangeLog b/ChangeLog
index 4843341..209b1e2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,8 @@
      ability to override the whole module.
    * New server-side implementation of session tickets that rotate keys to
      preserve forward secrecy, and allows sharing across multiple contexts.
+   * Reduced ROM fooprint of SHA-256 and added an option to reduce it even
+     more (at the expense of performance) MBEDTLS_SHA256_SMALLER.
 
 API Changes
    * All public identifiers moved to the mbedtls_* or MBEDTLS_* namespace.