diff --git a/spacy/tokens/span_group.pyi b/spacy/tokens/span_group.pyi
index 0b4aa83aa..d063bb595 100644
--- a/spacy/tokens/span_group.pyi
+++ b/spacy/tokens/span_group.pyi
@@ -1,4 +1,5 @@
-from typing import Any, Dict, Iterable, Optional
+from typing import Any, Dict, Iterable, Iterator, Optional
+
 from .doc import Doc
 from .span import Span
 
@@ -18,7 +19,7 @@ class SpanGroup:
     def doc(self) -> Doc: ...
     @property
     def has_overlap(self) -> bool: ...
-    def __iter__(self): ...
+    def __iter__(self) -> Iterator[Span]: ...
     def __len__(self) -> int: ...
     def append(self, span: Span) -> None: ...
     def extend(self, spans: Iterable[Span]) -> None: ...