diff --git a/protocols/osi1-2/arp.yml b/protocols/osi1-2/arp.yml
index 5ec47d6..c3aa527 100644
--- a/protocols/osi1-2/arp.yml
+++ b/protocols/osi1-2/arp.yml
@@ -2,6 +2,7 @@
 ---
 protocol: &arp
   name: arp
+  longname: Address Resolution Protocol
   osilayer: 2
   fields:
     - field: htype