diff --git a/Core/src/org/sleuthkit/autopsy/modules/vmextractor/VMExtractorIngestModule.java b/Core/src/org/sleuthkit/autopsy/modules/vmextractor/VMExtractorIngestModule.java
index f74e61d3dc..071a825e89 100644
--- a/Core/src/org/sleuthkit/autopsy/modules/vmextractor/VMExtractorIngestModule.java
+++ b/Core/src/org/sleuthkit/autopsy/modules/vmextractor/VMExtractorIngestModule.java
@@ -240,6 +240,7 @@ final class VMExtractorIngestModule extends DataSourceIngestModuleAdapter {
         ImageDSProcessor dataSourceProcessor = new ImageDSProcessor();
         AddDataSourceCallback dspCallback = new AddDataSourceCallback(vmFile);
         synchronized (this) {
+            // for extracted virtual machines we use UUID as data source ID because there is no manifest XML file
             dataSourceProcessor.run(taskId.toString(), vmFile.toString(), "", false, new AddDataSourceProgressMonitor(), dspCallback);
             /*
              * Block the ingest thread until the data source processor finishes.