diff --git a/swagger/docs.go b/swagger/docs.go
index 2880cf1f4..a7fe807b3 100644
--- a/swagger/docs.go
+++ b/swagger/docs.go
@@ -5165,6 +5165,10 @@ const docTemplate = `{
                     "items": {
                         "$ref": "#/definitions/gallery.NodeDriftInfo"
                     }
+                },
+                "reason": {
+                    "description": "Reason says why the backend is flagged when version and digest alone\nwould not flag it: the backend failed a request in a way that shows it\nis older than the server. Empty for ordinary version or digest upgrades.",
+                    "type": "string"
                 }
             }
         },
diff --git a/swagger/swagger.json b/swagger/swagger.json
index b5825d5fe..218478fc0 100644
--- a/swagger/swagger.json
+++ b/swagger/swagger.json
@@ -5162,6 +5162,10 @@
                     "items": {
                         "$ref": "#/definitions/gallery.NodeDriftInfo"
                     }
+                },
+                "reason": {
+                    "description": "Reason says why the backend is flagged when version and digest alone\nwould not flag it: the backend failed a request in a way that shows it\nis older than the server. Empty for ordinary version or digest upgrades.",
+                    "type": "string"
                 }
             }
         },
diff --git a/swagger/swagger.yaml b/swagger/swagger.yaml
index 623af08fe..a7ec22800 100644
--- a/swagger/swagger.yaml
+++ b/swagger/swagger.yaml
@@ -362,6 +362,12 @@ definitions:
         items:
           $ref: '#/definitions/gallery.NodeDriftInfo'
         type: array
+      reason:
+        description: |-
+          Reason says why the backend is flagged when version and digest alone
+          would not flag it: the backend failed a request in a way that shows it
+          is older than the server. Empty for ordinary version or digest upgrades.
+        type: string
     type: object
   gallery.Variant:
     properties: