diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 30e4d13..c65ed92 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -3997,4 +3997,13 @@
  */
 //#define MBEDTLS_P256M_EXAMPLE_DRIVER_ENABLED
 
+
+/**
+ * Uncomment to enable using new bignum code in the ECC modules.
+ *
+ * \warning ECC implementation using new bignum code is a work in progress,
+ * this option serves only development and testing purposes.
+ */
+//#define MBEDTLS_ECP_WITH_MPI_UINT
+
 /** \} name SECTION: Module configuration options */