Deprecate MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index b8980f2..e8a2f36 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1198,6 +1198,9 @@
* bandwidth, and (2) the peer is an Mbed TLS stack that doesn't use
* the fixed implementation yet (pre-2.1.10).
*
+ * \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