diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 33df091..fca4833 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -618,6 +618,9 @@
 	memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
 
 	__skb_pull(skb, 2 * ETH_ALEN);
+	/* We are going to push all headers that we pull, so no need to
+	 * update skb->csum here.
+	 */
 
 	if (vlan_tx_tag_present(skb))
 		key->eth.tci = htons(skb->vlan_tci);