diff --git a/content/docs/specifications/data-resource.md b/content/docs/specifications/data-resource.md
index 2be7bc64..87086287 100644
--- a/content/docs/specifications/data-resource.md
+++ b/content/docs/specifications/data-resource.md
@@ -190,7 +190,7 @@ The MD5 hash for this resource. Other algorithms can be indicated by prefixing t
 
 #### `sources`
 
-List of data sources as for [Data Package](../data-package/#sources).
+List of data sources as for [Data Package](../data-package/#sources). If not specified the resource inherits from the data package.
 
 #### `licenses`