diff --git a/src/calibre/gui2/dialogs/metadata_bulk.py b/src/calibre/gui2/dialogs/metadata_bulk.py
index 8829dc97c0..ce21eba00e 100644
--- a/src/calibre/gui2/dialogs/metadata_bulk.py
+++ b/src/calibre/gui2/dialogs/metadata_bulk.py
@@ -361,7 +361,7 @@ class MetadataBulkDialog(ResizableDialog, Ui_MetadataBulkDialog):
         fm = self.db.field_metadata
         for f in fm:
             if (f in ['author_sort'] or
-                    (fm[f]['datatype'] in ['text', 'series', 'enumeration']
+                    (fm[f]['datatype'] in ['text', 'series', 'enumeration', 'comments']
                      and fm[f].get('search_terms', None)
                      and f not in ['formats', 'ondevice']) or
                     (fm[f]['datatype'] in ['int', 'float', 'bool'] and