diff --git a/themis/ocrloader/ocrloader.py b/themis/ocrloader/ocrloader.py
index 8835d0e..d0a04b5 100644
--- a/themis/ocrloader/ocrloader.py
+++ b/themis/ocrloader/ocrloader.py
@@ -128,6 +128,7 @@ class LoadFromOcr(BrowserView):
                     kwargs = {'no_du_dossier': number,
                               'categorie': category}
                 else:
+                    logging.warning('unknown document type (%s, %s)' % (doctype, filename))
                     continue
 
                 folder.invokeFactory(factory, id=ocr_id, title=ocr_title,