diff --git a/api/src/main/java/com/theokanning/openai/assistants/assistant/FileSearchTool.java b/api/src/main/java/com/theokanning/openai/assistants/assistant/FileSearchTool.java
index 3b0a514..543ace0 100644
--- a/api/src/main/java/com/theokanning/openai/assistants/assistant/FileSearchTool.java
+++ b/api/src/main/java/com/theokanning/openai/assistants/assistant/FileSearchTool.java
@@ -5,9 +5,20 @@
  * @date 2024年04月18 13:36
  **/
 
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AllArgsConstructor;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
 @Data
+@NoArgsConstructor
+@AllArgsConstructor
 public class FileSearchTool implements Tool {
     final String type = "file_search";
+
+    /**
+     * The maximum number of results the file search tool should output. The default is 20 for gpt-4* models and 5 for gpt-3.5-turbo. This number should be between 1 and 50 inclusive.
+     */
+    @JsonProperty("max_num_results")
+    Integer maxNumResults;
 }
diff --git a/api/src/test/resources/assistants/Assistant.json b/api/src/test/resources/assistants/Assistant.json
index 43d83f4..569b094 100644
--- a/api/src/test/resources/assistants/Assistant.json
+++ b/api/src/test/resources/assistants/Assistant.json
@@ -7,7 +7,8 @@
   "instructions": "You are an HR bot, and you have access to files to answer employee questions about company policies.",
   "tools": [
     {
-      "type": "file_search"
+      "type": "file_search",
+      "max_num_results": 10
     }
   ],
   "tool_resources": {
diff --git a/api/src/test/resources/assistants/AssistantRequest.json b/api/src/test/resources/assistants/AssistantRequest.json
index c420b15..c0a8b89 100644
--- a/api/src/test/resources/assistants/AssistantRequest.json
+++ b/api/src/test/resources/assistants/AssistantRequest.json
@@ -3,7 +3,8 @@
   "name": "Math Tutor",
   "tools": [
     {
-      "type": "file_search"
+      "type": "file_search",
+      "max_num_results": 1
     }
   ],
   "tool_resources": {
diff --git a/example/src/main/java/example/AssistantExample.java b/example/src/main/java/example/AssistantExample.java
index f228ac7..cead5b3 100644
--- a/example/src/main/java/example/AssistantExample.java
+++ b/example/src/main/java/example/AssistantExample.java
@@ -192,7 +192,7 @@ static void fileSearchExample() throws UnsupportedEncodingException {
                 .name("file search assistant")
                 .instructions("你是一个中国传统音乐教授,负责根据用户的需求解答问题")
                 //add file search tool to assistant
-                .tools(Collections.singletonList(new FileSearchTool()))
+                .tools(Collections.singletonList(new FileSearchTool(1)))
                 .temperature(0D)
                 .build();
         Assistant assistant = service.createAssistant(assistantRequest);