diff --git a/Documentation/DeveloperInfo/USB_protocol_v12.pdf b/Documentation/DeveloperInfo/USB_protocol_v12.pdf
index 564df3b..d42c41d 100644
Binary files a/Documentation/DeveloperInfo/USB_protocol_v12.pdf and b/Documentation/DeveloperInfo/USB_protocol_v12.pdf differ
diff --git a/Documentation/DeveloperInfo/USB_protocol_v12.tex b/Documentation/DeveloperInfo/USB_protocol_v12.tex
index 2db0a2f..dd4aca8 100644
--- a/Documentation/DeveloperInfo/USB_protocol_v12.tex
+++ b/Documentation/DeveloperInfo/USB_protocol_v12.tex
@@ -168,7 +168,7 @@
 \clearpage
 
 \section{USB device}
-The LibreVNA implements a ``custom class'' USB device. It uses a VID of 0x0483 and a PID of 0x4142. The custom class contains a single interface with three bulk endpoints:
+The LibreVNA implements a ``custom class'' USB device. It uses a VID of 0x0483 and a PID of 0x4121. The custom class contains a single interface with three bulk endpoints:
 \begin{itemize}
 \item \textbf{Endpoint 0x01:} Communication data from the USB host to the LibreVNA
 \item \textbf{Endpoint 0x81:} Communication data from the LibreVNA to the USB host
@@ -1010,4 +1010,4 @@ This packet is used when multiple devices are synchronized over USB and can be t
 \subsection{ClearTrigger}
 This packet is used when multiple devices are synchronized over USB and can be transmitted in both directions. It has no payload. Synchronized devices must be logically organized in a closed loop. When a ClearTrigger packet is received from any devices in the loop it must be passed on to the next device in the loop.
 
-\end{document}
\ No newline at end of file
+\end{document}