diff --git a/docarray/index/abstract.py b/docarray/index/abstract.py
index 13f4837cd61..783b701581d 100644
--- a/docarray/index/abstract.py
+++ b/docarray/index/abstract.py
@@ -387,7 +387,8 @@ def index(self, docs: Union[BaseDoc, Sequence[BaseDoc]], **kwargs):
 
         :param docs: Documents to index.
         """
-        self._logger.debug(f'Indexing {len(docs)} documents')
+        n_docs = 1 if isinstance(docs, BaseDoc) else len(docs)
+        self._logger.debug(f'Indexing {n_docs} documents')
         docs_validated = self._validate_docs(docs)
         data_by_columns = self._get_col_value_dict(docs_validated)
         self._index(data_by_columns, **kwargs)
diff --git a/docarray/index/backends/hnswlib.py b/docarray/index/backends/hnswlib.py
index 6caf5817272..756f80f78e4 100644
--- a/docarray/index/backends/hnswlib.py
+++ b/docarray/index/backends/hnswlib.py
@@ -203,7 +203,8 @@ def index(self, docs: Union[BaseDoc, Sequence[BaseDoc]], **kwargs):
         if kwargs:
             raise ValueError(f'{list(kwargs.keys())} are not valid keyword arguments')
 
-        self._logger.debug(f'Indexing {len(docs)} documents')
+        n_docs = 1 if isinstance(docs, BaseDoc) else len(docs)
+        self._logger.debug(f'Indexing {n_docs} documents')
         docs_validated = self._validate_docs(docs)
         data_by_columns = self._get_col_value_dict(docs_validated)
         hashed_ids = tuple(self._to_hashed_id(doc.id) for doc in docs_validated)