diff --git a/attr_specs.yaml b/attr_specs.yaml
index 228c2c7..dfa5085 100644
--- a/attr_specs.yaml
+++ b/attr_specs.yaml
@@ -1,82 +1,106 @@
+# NETCDF GLOBAL ATTRIBUTES SPECIFICATIONS
+
 - source_collection: activity_id
   attr_field_value_type: string_array
   is_required: true
+
 - source_collection: creation_date
   attr_field_value_type: string
   is_required: true
+
 - source_collection: contact
   attr_field_value_type: string
   is_required: true
+
 - source_collection: conventions
   attr_field_name: Conventions
   attr_field_value_type: string_array
   is_required: true
+
 - source_collection: dataset_contributor
   attr_field_value_type: string
   is_required: true
+
 - source_collection: data_specs_version
   attr_field_value_type: string
   is_required: true
+
 - source_collection: frequency
   attr_field_value_type: string
   is_required: true
+
 - source_collection: grid_label
+  source_collection_key: description
   attr_field_name: grid
-  specific_key: description
   attr_field_value_type: string
   is_required: true
+
 - source_collection: grid_label
   attr_field_value_type: string
   is_required: true
+
 - source_collection: institution_id
-  specific_key: description
+  source_collection_key: description
   attr_field_name: institution
   attr_field_value_type: string
   is_required: true
+
 - source_collection: institution_id
   attr_field_value_type: string
   is_required: true
+
 - source_collection: license
   attr_field_value_type: string
   is_required: true
+
 - source_collection: nominal_resolution
-  specific_key: description
+  source_collection_key: description
   attr_field_value_type: string
   is_required: true
+
 - source_collection: processing_code_location
   attr_field_value_type: string
   is_required: true
+
 - source_collection: product
   attr_field_value_type: string
   is_required: true
+
 - source_collection: realm
   attr_field_value_type: string_array
   is_required: true
+
 - source_collection: references
   attr_field_value_type: string
   is_required: true
+
 - source_collection: region
   attr_field_value_type: string
   is_required: true
+
 - source_collection: source_id
   attr_field_value_type: string
   is_required: true
+
 - source_collection: source_id
-  specific_key: label_extended
+  source_collection_key: label_extended
   attr_field_name: source
   attr_field_value_type: string
   is_required: true
+
 - source_collection: source_id
-  specific_key: drs_name
   attr_field_name: source_label
   attr_field_value_type: string
   is_required: true
+
 - source_collection: tracking_id
   attr_field_value_type: string
   is_required: true
+
 - source_collection: variable_id
   attr_field_value_type: string
   is_required: true
+
 - source_collection: variant_label
   attr_field_value_type: string
   is_required: true
diff --git a/catalog_specs.yaml b/catalog_specs.yaml
index c4160a7..090dab4 100644
--- a/catalog_specs.yaml
+++ b/catalog_specs.yaml
@@ -1,3 +1,5 @@
+# STAC CATALOG SPECIFICATIONS
+
 version: v1.0.2
 
 catalog_properties:
@@ -107,11 +109,6 @@ dataset_properties:
     catalog_field_value_type: string
     is_required: true
 
-  - source_collection: version
-    source_collection_term: creationdatenb
-    catalog_field_value_type: string
-    is_required: true
-
 file_properties:
   - source_collection: tracking_id
     catalog_field_value_type: string
diff --git a/drs_specs.yaml b/drs_specs.yaml
index a816615..3f1ffe8 100644
--- a/drs_specs.yaml
+++ b/drs_specs.yaml
@@ -1,3 +1,5 @@
+# DATA REFERENCE SYNTAX SPECIFICATIONS
+
 # DIRECTORY DRS SPECIFICATIONS
 directory:
   separator: /