diff --git a/sys/include/net/conn.h b/sys/include/net/conn.h
index b6b96c39dc04565e692154389ba11e328a2b882c..8577d746caf6a69fe4061579251e3fe046e7a4f7 100644
--- a/sys/include/net/conn.h
+++ b/sys/include/net/conn.h
@@ -9,6 +9,7 @@
 /**
  * @defgroup    net_conn    Application connection API
  * @ingroup     net
+ * @deprecated  Please use @ref net_sock instead
  * @brief       Provides a minimal common API for applications to connect to the
  *              different network stacks.
  *
diff --git a/sys/include/net/conn/ip.h b/sys/include/net/conn/ip.h
index 4df3e8626b1ef240ae68bb770ce74c42acf8f957..cdd24395f8241767b55efd2fcd68dcd7019dbc7d 100644
--- a/sys/include/net/conn/ip.h
+++ b/sys/include/net/conn/ip.h
@@ -9,6 +9,7 @@
 /**
  * @defgroup    net_conn_ip     Raw IPv4/IPv6 connections
  * @ingroup     net_conn
+ * @deprecated  Please use @ref net_sock_ip instead
  * @brief       Connection submodule for raw IPv4/IPv6 connections
  * @{
  *
diff --git a/sys/include/net/conn/tcp.h b/sys/include/net/conn/tcp.h
index aa02fa7e048fe18ee176b3e4915804af1958ce04..7e5a17f6b9c4bb09fd72f5612aad78171d486629 100644
--- a/sys/include/net/conn/tcp.h
+++ b/sys/include/net/conn/tcp.h
@@ -9,6 +9,7 @@
 /**
  * @defgroup    net_conn_tcp    TCP connections
  * @ingroup     net_conn
+ * @deprecated  Please use @ref net_sock_tcp instead
  * @brief       Connection submodule for TCP connections
  * @{
  *
diff --git a/sys/include/net/conn/udp.h b/sys/include/net/conn/udp.h
index b59ac07ce49d2066851641eeea1af06306611e13..d1f6102ede1ee2a589d415579b6611955f9dd6d5 100644
--- a/sys/include/net/conn/udp.h
+++ b/sys/include/net/conn/udp.h
@@ -9,6 +9,7 @@
 /**
  * @defgroup    net_conn_udp    UDP connections
  * @ingroup     net_conn
+ * @deprecated  Please use @ref net_sock_udp instead
  * @brief       Connection submodule for UDP connections
  * @{
  *