diff --git a/ethertype-dump.c b/ethertype-dump.c
index eb97788..4e9b528 100644
--- a/ethertype-dump.c
+++ b/ethertype-dump.c
@@ -1,4 +1,5 @@
 #include <arpa/inet.h>
+#include <assert.h>
 #include <err.h>
 #include <errno.h>
 #include <linux/if_packet.h>
@@ -12,6 +13,21 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+char hexify(int nybble) {
+	assert(0 <= nybble && nybble <= 16);
+	return "0123456789abcdef"[nybble];
+}
+
+void format_mac(const unsigned char binary_address[6], char formatted[18]) {
+	for (size_t i = 0; i < 6; i++) {
+		unsigned char byte = binary_address[i];
+		formatted[3*i] = hexify(byte >> 4);
+		formatted[3*i + 1] = hexify(byte & 0xf);
+		formatted[3*i + 2] = ':';
+	}
+	formatted[17] = '\0';
+}
+
 int main(void) {
 	// Create a packet socket
 	errno = 0;
@@ -47,13 +63,25 @@ int main(void) {
 			err(1, "recv");
 		}
 
+		if (frame_length < 64) {
+			errno = 0;
+			if (printf("Runt frame (%zdB)\n", frame_length) == -1) {
+				err(1, "printf");
+			}
+			continue;
+		}
+
+		// Extract the MACs
+		// 012345 012345
+		// dest   source
+		char destination_mac[18], source_mac[18];
+		format_mac(&frame[0], destination_mac);
+		format_mac(&frame[6], source_mac);
+
 		// Extract EtherType / length field
 		// 012345 012345 01
 		// dest   source ^^
 		// It is stored in the network byte order, that is, high byte 1st
-		if (frame_length < 14) {
-			errx(1, "Very weird frame of only %zdB???", frame_length);
-		}
 		uint16_t ethertype = (frame[12] << 8) | frame[13];
 
 		const char *ethertype_meaning = NULL;
@@ -69,13 +97,18 @@ int main(void) {
 			ethertype_meaning = "IPv6";
 		}
 
+		errno = 0;
+		if(printf("%s -> %s ethertype: %02x%02x", source_mac, destination_mac, ethertype >> 8, ethertype & 0xff) == -1) {
+			err(1, "printf");
+		}
+
 		errno = 0;
 		if (ethertype_meaning == NULL) {
-			if (printf("ethertype: %02x%02x, length: %zd\n", ethertype >> 8, ethertype & 0xff, frame_length) == -1) {
+			if (printf(", length: %zd\n", frame_length) == -1) {
 				err(1, "printf");
 			}
 		} else {
-			if (printf("ethertype: %02x%02x (%s), length: %zd\n", ethertype >> 8, ethertype & 0xff, ethertype_meaning, frame_length) == -1) {
+			if (printf("(%s), length: %zd\n", ethertype_meaning, frame_length) == -1) {
 				err(1, "printf");
 			}
 		}