diff --git a/README.md b/README.md
index 38f936e1..6e8d6507 100644
--- a/README.md
+++ b/README.md
@@ -159,7 +159,38 @@ response = rag.query(
 )
 ```
 
+### Custom Prompt Support
+LightRAG now supports custom prompts for fine-tuned control over the system's behavior. Here's how to use it:
 
+```python
+from lightrag import LightRAG, QueryParam
+
+# Initialize LightRAG
+rag = LightRAG(working_dir=WORKING_DIR)
+
+# Create query parameters
+query_param = QueryParam(
+    mode="hybrid",  # or other mode: "local", "global", "hybrid"
+)
+
+# Example 1: Using the default system prompt
+response_default = rag.query(
+    "What are the primary benefits of renewable energy?",
+    param=query_param
+)
+print(response_default)
+
+# Example 2: Using a custom prompt
+custom_prompt = """
+You are an expert assistant in environmental science. Provide detailed and structured answers with examples.
+"""
+response_custom = rag.query(
+    "What are the primary benefits of renewable energy?",
+    param=query_param,
+    prompt=custom_prompt  # Pass the custom prompt
+)
+print(response_custom)
+```
 
 
 <details>
diff --git a/lightrag/lightrag.py b/lightrag/lightrag.py
index 0918c1ba..7e8a3bb7 100644
--- a/lightrag/lightrag.py
+++ b/lightrag/lightrag.py
@@ -892,11 +892,13 @@ class LightRAG:
             if update_storage:
                 await self._insert_done()
 
-    def query(self, query: str, param: QueryParam = QueryParam()):
+    def query(self, query: str, prompt: str = "", param: QueryParam = QueryParam()):
         loop = always_get_an_event_loop()
-        return loop.run_until_complete(self.aquery(query, param))
+        return loop.run_until_complete(self.aquery(query, prompt, param))
 
-    async def aquery(self, query: str, param: QueryParam = QueryParam()):
+    async def aquery(
+        self, query: str, prompt: str = "", param: QueryParam = QueryParam()
+    ):
         if param.mode in ["local", "global", "hybrid"]:
             response = await kg_query(
                 query,
@@ -914,6 +916,7 @@ class LightRAG:
                     global_config=asdict(self),
                     embedding_func=None,
                 ),
+                prompt=prompt,
             )
         elif param.mode == "naive":
             response = await naive_query(
diff --git a/lightrag/operate.py b/lightrag/operate.py
index 0469fb7e..10c76bcc 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -574,6 +574,7 @@ async def kg_query(
     query_param: QueryParam,
     global_config: dict,
     hashing_kv: BaseKVStorage = None,
+    prompt: str = "",
 ) -> str:
     # Handle cache
     use_model_func = global_config["llm_model_func"]
@@ -637,7 +638,7 @@ async def kg_query(
             query_param.conversation_history, query_param.history_turns
         )
 
-    sys_prompt_temp = PROMPTS["rag_response"]
+    sys_prompt_temp = prompt if prompt else PROMPTS["rag_response"]
     sys_prompt = sys_prompt_temp.format(
         context_data=context,
         response_type=query_param.response_type,