diff --git a/pkg/emb6/doc.txt b/pkg/emb6/doc.txt
index cbf7ecef48..644009a801 100644
--- a/pkg/emb6/doc.txt
+++ b/pkg/emb6/doc.txt
@@ -5,6 +5,10 @@
  * @brief    emb6 network stack
  * @see      https://github.com/hso-esk/emb6/blob/14e4a3cfff01644e078870e14e16a1fe60dcc895/doc/pdf/emb6.pdf
  *
+ * @deprecated  Based on very old version of `emb6` and the package is
+ *              basically unmaintained; will be removed after the 2020.07
+ *              release.
+ *
  * emb6 is a fork of Contiki's uIP network stack without its usage of
  * proto-threads. It uses periodic event polling instead.
  */