diff --git a/docs/development/firmware/port-numbers.mdx b/docs/development/firmware/port-numbers.mdx
index 6afcb940..c0bfea43 100644
--- a/docs/development/firmware/port-numbers.mdx
+++ b/docs/development/firmware/port-numbers.mdx
@@ -6,7 +6,7 @@ sidebar_label: Port Numbers
 
 Any new app that runs on the device or via sister apps on phones/PCs should pick and use a unique "portnum" for their applications use.
 
-The current list of port numbers can be found listed in the [protobufs](https://buf.build/meshtastic/protobufs/docs/main:meshtastic#meshtastic.CriticalErrorCode)
+The current list of port numbers can be found listed in the [protobufs](https://buf.build/meshtastic/protobufs/docs/main:meshtastic#meshtastic.PortNum)
 
 ## Assignment