diff --git a/src/main/java/eu/openaire/urls_worker/models/Payload.java b/src/main/java/eu/openaire/urls_worker/models/Payload.java
index e2095d8..33fdabf 100644
--- a/src/main/java/eu/openaire/urls_worker/models/Payload.java
+++ b/src/main/java/eu/openaire/urls_worker/models/Payload.java
@@ -49,8 +49,8 @@ public class Payload {
     @JsonProperty("provenance")
     private String provenance;  // "crawl:<PluginName>"
 
-    @JsonProperty("provenance")
-    private String datasourceId;  // "crawl:<PluginName>"
+    @JsonProperty("datasourceId")
+    private String datasourceId;
 
 
     public Payload() {}
diff --git a/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java b/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java
index 63c9501..d7d7424 100644
--- a/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java
+++ b/src/main/java/eu/openaire/urls_worker/plugins/PublicationsRetrieverPlugin.java
@@ -223,6 +223,9 @@ public class PublicationsRetrieverPlugin {
             String urlId = data.getUrlId();
             String datasourceId = urlIdsWithDatasourceIds.get(urlId);
 
+            // Each record will have the urlID, the datasourceID and possibly one filename, which may contain a different urlID.
+            // The Controller will select the correct datasourceID for before adding it inside the S3-ObjectStore filename.
+
             Payload payload = new Payload(urlId, data.getSourceUrl(), docOrDatasetUrl, timestamp, mimeType, size, hash, fileLocation, "crawl:PublicationsRetriever", datasourceId);
             // TODO - If support is added for other doc-formats other than "pdf", then make sure the "mime_type" is correctly specified.