DOC: add comment to test

integrationtests/test_realworld_example.py

@@ -108,6 +108,7 @@ def test_dataset(clear_database, usemodel, addfiles):
         os.path.join(DATADIR, "provenance.yml"),
         False,
         remove_prefix=DATADIR,
+        # this test will fail without this prefix since the crawler would try to create new files
         add_prefix="/extroot/realworld_example"
     )
 
@@ -142,6 +143,7 @@ def test_event_update(clear_database, usemodel, addfiles):
         os.path.join(DATADIR, "provenance.yml"),
         False,
         remove_prefix=DATADIR,
+        # this test will fail without this prefix since the crawler would try to create new files
         add_prefix="/extroot/realworld_example"
     )