diff --git a/media/sctp/sctptransport.cc b/media/sctp/sctptransport.cc
index 41d4b7a0c5..112aac645f 100644
--- a/media/sctp/sctptransport.cc
+++ b/media/sctp/sctptransport.cc
@@ -186,6 +186,23 @@ bool GetDataMediaType(PayloadProtocolIdentifier ppid,
 }
 
 // Log the packet in text2pcap format, if log level is at LS_VERBOSE.
+//
+// In order to turn these logs into a pcap file you can use, first filter the
+// "SCTP_PACKET" log lines:
+//
+//   cat chrome_debug.log | grep SCTP_PACKET > filtered.log
+//
+// Then run through text2pcap:
+//
+//   text2pcap -t "%H:%M:%S." -D -u 1024,1024 filtered.log filtered.pcap
+//
+// The value "1024" isn't important, we just need a port for the dummy UDP
+// headers generated. Lastly, you should be able to open filtered.pcap in
+// Wireshark, then right click a packet and "Decode As..." SCTP.
+//
+// Why do all this? Because SCTP goes over DTLS, which is encrypted. So just
+// getting a normal packet capture won't help you, unless you have the DTLS
+// keying material.
 void VerboseLogPacket(const void* data, size_t length, int direction) {
   if (LOG_CHECK_LEVEL(LS_VERBOSE) && length > 0) {
     char* dump_buf;