diff --git a/include/polarssl/config.h b/include/polarssl/config.h
index 05bcd86..731b90c 100644
--- a/include/polarssl/config.h
+++ b/include/polarssl/config.h
@@ -1070,6 +1070,8 @@
  * CRIME attack. Before enabling this option, you should examine with care if
  * CRIME or similar exploits may be a applicable to your use case.
  *
+ * \note Currently compression can't bu used with DTLS.
+ *
  * Used in: library/ssl_tls.c
  *          library/ssl_cli.c
  *          library/ssl_srv.c