diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 2dc475b..ca1486d 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -737,6 +737,20 @@
  */
 //#define MBEDTLS_SSL_RECORD_SIZE_LIMIT
 
+/*
+ * \def MBEDTLS_SSL_KEYING_MATERIAL_EXPORT
+ *
+ * When this option is enabled, the client and server can extract additional
+ * shared symmetric keys after an SSL handshake using the function
+ * mbedtls_ssl_export_keying_material().
+ *
+ * The process for deriving the keys is specified in RFC 5705 for TLS 1.2 and
+ * in RFC 8446, Section 7.5, for TLS 1.3.
+ *
+ * Uncomment this macro to enable mbedtls_ssl_export_keying_material().
+ */
+//#define MBEDTLS_SSL_KEYING_MATERIAL_EXPORT
+
 /**
  * \def MBEDTLS_SSL_RENEGOTIATION
  *