diff --git a/specification/json/sections/cper-arm-processor.json b/specification/json/sections/cper-arm-processor.json
index 6efb2ae..ec70748 100644
--- a/specification/json/sections/cper-arm-processor.json
+++ b/specification/json/sections/cper-arm-processor.json
@@ -8,6 +8,7 @@
         "sectionLength",
         "errorAffinity",
         "mpidrEl1",
+        "affinity3",
         "midrEl1",
         "running",
         "errorInfo",
@@ -62,6 +63,9 @@
         "mpidrEl1": {
             "type": "integer"
         },
+        "affinity3": {
+            "type": "integer"
+        },
         "midrEl1": {
             "type": "integer"
         },