diff --git a/sys/net/gnrc/netapi/gnrc_netapi.c b/sys/net/gnrc/netapi/gnrc_netapi.c
index 266d0839f3..a8cecb285b 100644
--- a/sys/net/gnrc/netapi/gnrc_netapi.c
+++ b/sys/net/gnrc/netapi/gnrc_netapi.c
@@ -92,6 +92,7 @@ int gnrc_netapi_dispatch(gnrc_nettype_t type, uint32_t demux_ctx,
     if (numof != 0) {
         gnrc_netreg_entry_t *sendto = gnrc_netreg_lookup(type, demux_ctx);
 
+        /* the packet is replicated over all interfaces that is's being sent on */
         gnrc_pktbuf_hold(pkt, numof - 1);
 
         while (sendto) {
diff --git a/sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c b/sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c
index fea9c412b6..5fbabfb625 100644
--- a/sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c
+++ b/sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c
@@ -576,7 +576,7 @@ static void _send_multicast(gnrc_pktsnip_t *pkt, bool prep_hdr,
     if (!gnrc_netif_highlander()) {
         /* interface not given: send over all interfaces */
         if (netif == NULL) {
-            /* send packet to link layer */
+            /* the packet is replicated over all interfaces that is's being sent on */
             gnrc_pktbuf_hold(pkt, ifnum - 1);
 
             while ((netif = gnrc_netif_iter(netif))) {