diff --git a/extensions/openpower-pels/registry/README.md b/extensions/openpower-pels/registry/README.md
index f914bfc..05a35e9 100644
--- a/extensions/openpower-pels/registry/README.md
+++ b/extensions/openpower-pels/registry/README.md
@@ -253,6 +253,15 @@
 "DeconfigFlag": true
 ```
 
+### SRC Checkstop Flag
+
+This is used to indicate the PEL is for a hardware checkstop, and causes bit 0
+in hex word 5 of the SRC to be set.
+
+```json
+"CheckstopFlag": true
+```
+
 ### Documentation Fields
 
 The documentation fields are used by PEL parsers to display a human readable
diff --git a/extensions/openpower-pels/registry/message_registry.json b/extensions/openpower-pels/registry/message_registry.json
index c2b3e91..6c2e807 100644
--- a/extensions/openpower-pels/registry/message_registry.json
+++ b/extensions/openpower-pels/registry/message_registry.json
@@ -1677,6 +1677,7 @@
             "SRC": {
                 "ReasonCode": "0xE510",
                 "SymptomIDFields": ["SRCWord6", "SRCWord7", "SRCWord8"],
+                "CheckstopFlag": true,
                 "Words6To9": {
                     "6": {
                         "AdditionalDataPropSource": "SRC6"
diff --git a/extensions/openpower-pels/registry/schema/schema.json b/extensions/openpower-pels/registry/schema/schema.json
index 11885e5..4c548e5 100644
--- a/extensions/openpower-pels/registry/schema/schema.json
+++ b/extensions/openpower-pels/registry/schema/schema.json
@@ -102,7 +102,9 @@
 
                 "Words6To9": { "$ref": "#/definitions/srcWords6To9" },
 
-                "DeconfigFlag": { "$ref": "#/definitions/deconfigFlag" }
+                "DeconfigFlag": { "$ref": "#/definitions/deconfigFlag" },
+
+                "CheckstopFlag": { "$ref": "#/definitions/checkstopFlag" }
             },
 
             "required": ["ReasonCode", "Words6To9"],
@@ -139,6 +141,11 @@
             "type": "boolean"
         },
 
+        "checkstopFlag": {
+            "description": "Indicates the SRC is for a hardware checkstop.",
+            "type": "boolean"
+        },
+
         "docNotes": {
             "description": "Any notes/comments about the error. An array of strings for manual line wrapping. Optional.",
             "type": "array",