diff --git a/schemas/dataTypes/rasterGraphic.schema.tpl.json b/schemas/dataTypes/rasterGraphic.schema.tpl.json
index fe09829d..9c58b4c5 100644
--- a/schemas/dataTypes/rasterGraphic.schema.tpl.json
+++ b/schemas/dataTypes/rasterGraphic.schema.tpl.json
@@ -12,7 +12,7 @@
       "type": "array",
       "minItems": 1,
       "uniqueItems": true,
-      "_instruction": "Add all images in which this image is used or shown in a greater context.",
+      "_instruction": "Add all raster-based images in which this image is used or shown in a greater context.",
       "_linkedTypes": [
         "core:RasterGraphic",
         "core:Volume"