Improve documentation of MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT option
Explain more clearly when this option should be used and which versions of Mbed
TLS build on the non-compliant implementation.
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index f0cc95f..c72ee1d 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -719,7 +719,7 @@
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT)
/* Fall back to old, non-compliant version of the truncated
- * HMAC implementation which also truncates the key. */
+ * HMAC implementation which also truncates the key (pre 2.1.10) */
mac_key_len = transform->maclen;
#endif
}