diff --git a/Packet-structure.md b/Packet-structure.md
index 48e2aea..9799664 100644
--- a/Packet-structure.md
+++ b/Packet-structure.md
@@ -1,2 +1,6 @@
-* Packet size: 1-2 bytes (2 byte packet size indicated by 0x80 bit being set, in which case size = (first byte - 1) * 256 + second byte)
-* ObjID: Either 1 byte, or if byte is 0, then a string. 254 is a special destination called "CO"
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+* Packet size: 1-2 bytes (2 byte packet size indicated by 0x80 bit being set, in which case size = 32768 + second byte)
+* 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
+
+If the initial ObjID is "CO" (254), Packet data consists of ObjIDs followed by packet data for the packet type.
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