diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index a4db6ba..205c7be 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1034,6 +1034,16 @@
 //#define MBEDTLS_SHA512_SMALLER
 
 /**
+ * \def MBEDTLS_SHA512_NO_SHA384
+ *
+ * Disable the SHA-384 option of the SHA-512 module. Use this to save some
+ * code size on devices that don't use SHA-384.
+ *
+ * Uncomment to disable SHA-384
+ */
+//#define MBEDTLS_SHA512_NO_SHA384
+
+/**
  * \def MBEDTLS_THREADING_ALT
  *
  * Provide your own alternate threading implementation.