diff --git a/tests/lwip/Makefile b/tests/lwip/Makefile
index 2e1c844b49e31214bd0087471310a4f8efa1904e..c68fb177210c02c2d7af6a139768112e5a5ca397 100644
--- a/tests/lwip/Makefile
+++ b/tests/lwip/Makefile
@@ -9,6 +9,7 @@ BOARD_INSUFFICIENT_MEMORY := airfy-beacon arduino-mega2560 msb-430h nrf6310 \
                              nucleo-f334 pca10005 stm32f0discovery weio \
                              yunjia-nrf51822 z1
 
+# including lwip_ipv6_mld would currently break this test on at86rf2xx radios
 USEMODULE += lwip lwip_ipv6_autoconfig lwip_conn_ip lwip_netdev2
 USEMODULE += lwip_udp lwip_conn_udp
 USEMODULE += ipv6_addr