Clarify that there are two SSL I/O buffers
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 376de6f..17271c1 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2399,7 +2399,7 @@
//#define MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES 50 /**< Maximum entries in cache */
/* SSL options */
-//#define MBEDTLS_SSL_MAX_CONTENT_LEN 16384 /**< Size of the input / output buffer */
+//#define MBEDTLS_SSL_MAX_CONTENT_LEN 16384 /**< Maxium fragment length in bytes, determines the size of each of the two internal I/O buffers */
//#define MBEDTLS_SSL_DEFAULT_TICKET_LIFETIME 86400 /**< Lifetime of session tickets (if enabled) */
//#define MBEDTLS_PSK_MAX_LEN 32 /**< Max size of TLS pre-shared keys, in bytes (default 256 bits) */
//#define MBEDTLS_SSL_COOKIE_TIMEOUT 60 /**< Default expiration delay of DTLS cookies, in seconds if HAVE_TIME, or in number of cookies issued */