diff --git a/docs/about/changelog.md b/docs/about/changelog.md
index 81591f8f..818eda25 100644
--- a/docs/about/changelog.md
+++ b/docs/about/changelog.md
@@ -22,6 +22,7 @@ This page lists changes to the Risk Data Library Standard.
 - [#396](https://github.com/GFDRR/rdl-standard/pull/396)
   - `Entity`: Require any of `.email`, `.url`.
   - `Event.ocurrence`: Require any of `.probabilistic`, `.empirical`, `.deterministic`.
+- [#398](https://github.com/GFDRR/rdl-standard/pull/398) - Add `spatial_aggregation` to `Resource`.
 - [#400](https://github.com/GFDRR/rdl-standard/pull/400):
   - Move `.sources` to `.lineage.sources`
   - Add `Source.risk_data_type`
diff --git a/schema/rdls_schema.json b/schema/rdls_schema.json
index 5297aad3..7299156b 100644
--- a/schema/rdls_schema.json
+++ b/schema/rdls_schema.json
@@ -450,6 +450,12 @@
           "description": "The minimum spatial separation resolvable in this resource, measured in meters.",
           "exclusiveMinimum": 0
         },
+        "spatial_aggregation": {
+          "title": "Spatial aggregation",
+          "type": "string",
+          "description": "The fundamental spatial unit or geometric container used to organise, summarise, or 'bin' the data within this resource. This describes whether the data is unaggregated (e.g., individual building footprints or asset points), or aggregated into standardised administrative divisions (e.g., municipalities), hydrological units (e.g., catchments), or calculated geometric grids (e.g., hexagons or square gridcells).",
+          "minLength": 1
+        },
         "coordinate_system": {
           "title": "Coordinate reference system",
           "type": "string",