diff --git a/semantic_split/splitters/SimilarSentenceSplitter.py b/semantic_split/splitters/SimilarSentenceSplitter.py
index bcaa794..e9636ce 100644
--- a/semantic_split/splitters/SimilarSentenceSplitter.py
+++ b/semantic_split/splitters/SimilarSentenceSplitter.py
@@ -11,7 +11,7 @@ def __init__(self, similarity_model, sentence_splitter: Splitter):
         self.model = similarity_model
         self.sentence_splitter = sentence_splitter
 
-    def split(self, text: str, group_max_sentences=5) -> List[str]:
+    def split(self, text: str, group_max_sentences=5) -> List[List[str]]:
         '''
             group_max_sentences: The maximum number of sentences in a group.
         '''
@@ -36,4 +36,4 @@ def split(self, text: str, group_max_sentences=5) -> List[str]:
             else:
                 groups.append([sentences[i]])
 
-        return groups
\ No newline at end of file
+        return groups