diff --git a/spacy/tokens/doc.pyi b/spacy/tokens/doc.pyi
index 365859d89..4a17c47bb 100644
--- a/spacy/tokens/doc.pyi
+++ b/spacy/tokens/doc.pyi
@@ -125,7 +125,7 @@ class Doc:
         vector: Optional[Floats1d] = ...,
         alignment_mode: str = ...,
         span_id: Union[int, str] = ...,
-    ) -> Span: ...
+    ) -> Optional[Span]: ...
     def similarity(self, other: Union[Doc, Span, Token, Lexeme]) -> float: ...
     @property
     def has_vector(self) -> bool: ...