Deprecate MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index fa935c7..6082d46 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1374,6 +1374,9 @@
* (2) the peer is an Mbed TLS stack that doesn't use the fixed
* implementation yet (version number <= 2.6.0).
*
+ * \deprecated This option is deprecated and will likely be removed in a
+ * future version of Mbed TLS.
+ *
* Uncomment to fallback to old, non-compliant truncated HMAC implementation.
*
* Requires: MBEDTLS_SSL_TRUNCATED_HMAC