Index: media/libnestegg/src/nestegg.c
===================================================================
--- media/libnestegg/src/nestegg.c
+++ media/libnestegg/src/nestegg.c
@@ -1024,10 +1024,11 @@
 ne_read_uint(ne_io * io, uint64_t * val, uint64_t length)
 {
   unsigned char b;
   int r;
 
+  /* Mozilla: EBML unsigned integers are 1..8 bytes wide (RFC 8794 s7.1). */
   if (length > 8)
     return -1;
 
   *val = 0;
   while (length--) {