diff --git a/tests/nanocoap_cli/Makefile b/tests/nanocoap_cli/Makefile
index 2393540fbe..d506127f12 100644
--- a/tests/nanocoap_cli/Makefile
+++ b/tests/nanocoap_cli/Makefile
@@ -6,7 +6,12 @@ USEMODULE += netdev_default
 USEMODULE += auto_init_gnrc_netif
 # Specify the mandatory networking modules
 USEMODULE += gnrc_ipv6_default
-USEMODULE += sock_udp
+
+# Optionally include DNS support. This includes resolution of names at an
+# upstream DNS server and the handling of RDNSS options in Router Advertisements
+# to auto-configure that upstream DNS server.
+# USEMODULE += sock_dns              # include DNS client
+# USEMODULE += gnrc_ipv6_nib_dns     # include RDNSS option handling
 
 USEMODULE += nanocoap_sock