diff --git a/Component-Modem.md b/Component-Modem.md
index b5dc7d5..3feafb6 100644
--- a/Component-Modem.md
+++ b/Component-Modem.md
@@ -4,6 +4,8 @@ Component name: `modem`.
 Callbacks:
 - `isWireless(): boolean`  
   Returns whether this modem is capable of sending wireless messages.
+- `maxPacketSize(): number`
+  Returns the maximum packet size for sending messages via network cards. Defaults to 8192, doesn't apply to HTTP traffic. You can change this in the OpenComputer configuration file.
 - `isOpen(port: number): boolean`  
   Returns whether the specified "port" is currently being listened on. Messages only trigger signals when they arrive on a port that is open.
 - `open(port: number): boolean`