diff --git a/README.md b/README.md
index eef2ae53..7670e3da 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ pip install lightrag-hku
 
 ## Quick Start
 
-* Set OpenAI API key in environment: `export OPENAI_API_KEY="sk-...".`
+* Set OpenAI API key in environment: `export OPENAI_API_KEY="sk-..."`.
 * Download the demo text "A Christmas Carol by Charles Dickens" 
 ```
 curl https://raw.githubusercontent.com/gusye1234/nano-graphrag/main/tests/mock_data.txt > ./book.txt
@@ -30,7 +30,12 @@ Use the below python snippet:
 ```
 from lightrag import LightRAG, QueryParam
 
-rag = LightRAG(working_dir="./dickens")
+WORKING_DIR = "./dickens"
+
+if not os.path.exists(WORKING_DIR):
+    os.mkdir(WORKING_DIR)
+
+rag = LightRAG(working_dir=WORKING_DIR)
 
 with open("./book.txt") as f:
     rag.insert(f.read())
diff --git a/lightrag/lightrag.py b/lightrag/lightrag.py
index f11e868b..836fda9e 100644
--- a/lightrag/lightrag.py
+++ b/lightrag/lightrag.py
@@ -166,7 +166,7 @@ class LightRAG:
         try:
             if isinstance(string_or_strings, str):
                 string_or_strings = [string_or_strings]
-            # ---------- new docs
+
             new_docs = {
                 compute_mdhash_id(c.strip(), prefix="doc-"): {"content": c.strip()}
                 for c in string_or_strings
@@ -178,7 +178,6 @@ class LightRAG:
                 return
             logger.info(f"[New Docs] inserting {len(new_docs)} docs")
 
-            # ---------- chunking
             inserting_chunks = {}
             for doc_key, doc in new_docs.items():
                 chunks = {
@@ -207,7 +206,19 @@ class LightRAG:
 
             await self.chunks_vdb.upsert(inserting_chunks)
 
-            # ---------- commit upsertings and indexing
+            logger.info("[Entity Extraction]...")
+            maybe_new_kg = await extract_entities(
+                inserting_chunks,
+                knwoledge_graph_inst=self.chunk_entity_relation_graph,
+                entity_vdb=self.entities_vdb,
+                relationships_vdb=self.relationships_vdb,
+                global_config=asdict(self),
+            )
+            if maybe_new_kg is None:
+                logger.warning("No new entities and relationships found")
+                return
+            self.chunk_entity_relation_graph = maybe_new_kg
+
             await self.full_docs.upsert(new_docs)
             await self.text_chunks.upsert(inserting_chunks)
         finally:
diff --git a/lightrag/operate.py b/lightrag/operate.py
index a8564f0d..2d3271da 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -940,5 +940,5 @@ async def naive_query(
         query,
         system_prompt=sys_prompt,
     )
-    return (response, section)
+    return response