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 62de5f2..3cd1d62 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -718,7 +718,8 @@
#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
+ * (Mbed TLS versions from 1.3 to 2.6.0) */
mac_key_len = transform->maclen;
#endif
}