diff --git a/src/nbwrite/config.py b/src/nbwrite/config.py
index 28e5c93..9d46f83 100644
--- a/src/nbwrite/config.py
+++ b/src/nbwrite/config.py
@@ -6,6 +6,7 @@
     DEFAULT_LLM_KWARGS,
     DEFAULT_RETRIEVER_KWARGS,
     DEFAULT_SYSTEM_PROMPT,
+    DEFAULT_TEXT_SPLITTER_KWARGS,
 )
 
 
@@ -14,6 +15,7 @@ class GenerationConfig(BaseModel):
     system_prompt: str = DEFAULT_SYSTEM_PROMPT
     llm_kwargs: Dict[str, Any] = DEFAULT_LLM_KWARGS
     retriever_kwargs: Dict[str, Any] = DEFAULT_RETRIEVER_KWARGS
+    text_splitter_kwargs: Dict[str, Any] = DEFAULT_TEXT_SPLITTER_KWARGS
 
 
 class Config(BaseModel):
diff --git a/src/nbwrite/constants.py b/src/nbwrite/constants.py
index a96ea41..fdaa32e 100644
--- a/src/nbwrite/constants.py
+++ b/src/nbwrite/constants.py
@@ -4,6 +4,11 @@
     "max_tokens": 512,
 }
 
+DEFAULT_TEXT_SPLITTER_KWARGS = {
+    "chunk_size": 2000,
+    "chunk_overlap": 200,
+}
+
 DEFAULT_RETRIEVER_KWARGS = {
     "k": 5,
     "search_type": "mmr",
diff --git a/src/nbwrite/index.py b/src/nbwrite/index.py
index 272a951..b068acf 100644
--- a/src/nbwrite/index.py
+++ b/src/nbwrite/index.py
@@ -17,10 +17,14 @@
     sys.modules["sqlite3"] = sys.modules.pop("pysqlite3")
 
 
-def create_index(pkgs: List[str], retriever_kwargs: Dict[str, Any]):
+def create_index(
+    pkgs: List[str],
+    retriever_kwargs: Dict[str, Any],
+    text_splitter_kwargs: Dict[str, Any],
+):
 
     python_splitter = RecursiveCharacterTextSplitter.from_language(
-        language=Language.PYTHON, chunk_size=2000, chunk_overlap=200
+        language=Language.PYTHON, **text_splitter_kwargs
     )
 
     texts = []
diff --git a/src/nbwrite/writer.py b/src/nbwrite/writer.py
index 3a0b1b1..5493c2d 100644
--- a/src/nbwrite/writer.py
+++ b/src/nbwrite/writer.py
@@ -56,7 +56,11 @@ def gen(
         ]
     )
 
-    retriever = create_index(config.packages, config.generation.retriever_kwargs)
+    retriever = create_index(
+        config.packages,
+        config.generation.retriever_kwargs,
+        config.generation.text_splitter_kwargs,
+    )
 
     def _combine_documents(
         docs, document_prompt=PromptTemplate.from_template(template="{page_content}"), document_separator="\n\n"  # type: ignore