diff --git a/StorylinesSchema.json b/StorylinesSchema.json
index 3e397bef..e88066e9 100644
--- a/StorylinesSchema.json
+++ b/StorylinesSchema.json
@@ -285,6 +285,10 @@
                 "type": {
                     "type": "string",
                     "enum": ["video"]
+                }, 
+                "modified": {
+                    "type": "boolean",
+                    "description": "An optional tag that specifies whether the panel has been modified from its default configuration"
                 }
             },
             "required": ["src", "type"]
diff --git a/public/StorylinesSlideSchema.json b/public/StorylinesSlideSchema.json
index 384caad4..11d04c03 100644
--- a/public/StorylinesSlideSchema.json
+++ b/public/StorylinesSlideSchema.json
@@ -366,6 +366,10 @@
                 "customStyles": {
                     "type": "string",
                     "description": "Additional CSS styles to apply to the panel."
+                }, 
+                "modified": {
+                    "type": "boolean",
+                    "description": "An optional tag that specifies whether the panel has been modified from its default configuration" 
                 }
             },
             "additionalProperties": false,