diff --git a/Packet-structure.md b/Packet-structure.md
index 9799664..5fae3d6 100644
--- a/Packet-structure.md
+++ b/Packet-structure.md
@@ -1,4 +1,4 @@
-* Packet size: 1-2 bytes (2 byte packet size indicated by 0x80 bit being set, in which case size = 32768 + second byte)
+* Packet size: 1-2 bytes. 2 byte mode looks defective on Worlds 1920, and non-existent on 1904 and below.
 * ObjID: Either 1 byte, or if byte is 0, then after that a thing I will call a WorldsString. 254 is a special destination called "CO"
 * Packet type: 1 byte
 * Packet data