diff --git a/docs/proposed/config-split.md b/docs/proposed/config-split.md
index 6f3b5bd246..1baab356b2 100644
--- a/docs/proposed/config-split.md
+++ b/docs/proposed/config-split.md
@@ -396,6 +396,7 @@ PSA_WANT_\* macros as in current `crypto_config.h`.
 #define MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
 //#define MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED
 #define MBEDTLS_KEY_EXCHANGE_PSK_ENABLED
+#define MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
 #define MBEDTLS_SSL_ALL_ALERT_MESSAGES
 #define MBEDTLS_SSL_ALPN
 //#define MBEDTLS_SSL_ASYNC_PRIVATE