bpf: Clarify ip_hl check.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/bpf.c b/src/bpf.c
index b99e8c24..5a4d3c1d 100644
--- a/src/bpf.c
+++ b/src/bpf.c
@@ -540,7 +540,7 @@ static const struct bpf_insn bpf_bootp_ether[] = {
 #define BPF_BOOTP_ETHER_LEN	__arraycount(bpf_bootp_ether)
 
 static const struct bpf_insn bpf_bootp_filter[] = {
-	/* Make sure it's an IPv4 packet. */
+	/* Make sure it's an optionless IPv4 packet. */
 	BPF_STMT(BPF_LD + BPF_B + BPF_IND, 0),
 	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x45, 1, 0),
 	BPF_STMT(BPF_RET + BPF_K, 0),