diff --git a/doc/IOSDocument.md b/doc/IOSDocument.md
index 90569da..1f01480 100644
--- a/doc/IOSDocument.md
+++ b/doc/IOSDocument.md
@@ -41,10 +41,9 @@ V
     [LetsGameAPI instance].appId = @"10022";
     [LetsGameAPI instance].appKey = @"f899139df5e1059396431415e770c6dd";
     NSMutableDictionary *payInfo = [NSMutableDictionary dictionary];
-    [payInfo setValue:@"5001" forKey:@"serverId"];//服务器id
+    [payInfo setValue:@"5001" forKey:@"serverId"];//服务器id,必传参数
     [payInfo setValue:@"1000" forKey:@"channelId"];//渠道id
     [payInfo setValue:@"10" forKey:@"amount"];//金额
     [payInfo setValue:@"ios demo" forKey:@"extraInfo"];//外部订单信息
     [payInfo setValue:@"元宝" forKey:@"product"];//物品信息
-    [[LetsGameAPI instance] pay:payInfo];
-    
\ No newline at end of file
+    [[LetsGameAPI instance] pay:payInfo];
\ No newline at end of file