diff --git a/schemas/material_brdf_schema.json b/schemas/material_brdf_schema.json
index 5380d75..aafdb16 100644
--- a/schemas/material_brdf_schema.json
+++ b/schemas/material_brdf_schema.json
@@ -74,17 +74,10 @@
         },
         "wavelengthRange": {
           "type": "array",
-          "description": "Wavelength range covered by the lookup table.",
-          "items": [
-            {
-              "type": "number",
-              "description": "Min wavelength in meters."
+          "description": "Wavelength range covered by the lookup table. The first item is the minimum wavelength in meters and the second item is the maximum wavelength in meters.",
+          "items": {
+              "type": "number"
             },
-            {
-              "type": "number",
-              "description": "Max wavelength in meters."
-            }
-           ],
            "minItems": 2,
            "maxItems": 2
         },
@@ -95,9 +88,9 @@
         },
         "lookupTable": {
           "type": "array",
+          "description": "Array of bidirectional reflectance distribution function (BRDF) values, with each item representing a different property. The array SHALL be sorted based on the columns starting with the first.",
           "items": {
             "type": "array",
-            "description": "Array of bidirectional reflectance distribution function (BRDF) values, with each item representing a different property. The array SHALL be sorted based on the columns starting with the first.",
             "items": [
               {
                 "type": ["number", "null"],
diff --git a/schemas/material_emp_schema.json b/schemas/material_emp_schema.json
index 9c8c18d..dffe133 100644
--- a/schemas/material_emp_schema.json
+++ b/schemas/material_emp_schema.json
@@ -66,9 +66,9 @@
     },
     "electromagneticProperties": {
       "type": "array",
+      "description": "Array of electromagnetic property values, with each item representing a different property. The array SHALL be sorted based on the columns starting with the first.",
       "items": {
         "type": "array",
-        "description": "Array of electromagnetic property values, with each item representing a different property. The array SHALL be sorted based on the columns starting with the first.",
         "items": [
           {
             "type": ["number", "null"],
diff --git a/scripts/json2asciidoc.py b/scripts/json2asciidoc.py
index eefaf47..d0c7c38 100644
--- a/scripts/json2asciidoc.py
+++ b/scripts/json2asciidoc.py
@@ -75,19 +75,22 @@ def generate_asciidoc_properties(properties, required_fields, level=2):
     for prop_name, prop_data in properties.items():
         heading_prefix = "=" * level  # Create heading based on level
         asciidoc_content += f"{heading_prefix} {prop_name}\n"
-        asciidoc_content += f"{prop_data.get('description', 'No description')}\n"
+        asciidoc_content += f"{prop_data.get('description', '')}\n"
 
         # Handle array types and generate description for array of arrays
         if prop_data.get('type') == "array":
             if isinstance(prop_data['items'], dict) and 'items' in prop_data['items']:
                 # Generate list for array of arrays
+                asciidoc_content += "Instance\n"
                 asciidoc_content += generate_asciidoc_array_of_arrays(prop_data['items']['items'], prop_data['items'].get('description', '')) + "\n"
             elif isinstance(prop_data['items'], list):
                 # If it's a list of items, generate columns description directly
+                asciidoc_content += "list\n"
                 asciidoc_content += generate_asciidoc_array_of_arrays(prop_data['items'], prop_data.get('description', '')) + "\n"
             else:
                 # Simple array, include the description of the array
-                asciidoc_content += f"\n{prop_data['items'].get('description', 'No description')}\n"
+                asciidoc_content += "simple\n"
+                asciidoc_content += f"\n{prop_data['items'].get('description', '')}\n"
         
         # Add pattern inline and handle escaping of backslashes and curly braces
         if "pattern" in prop_data: