diff --git a/doc/Serving_Configure_CN.md b/doc/Serving_Configure_CN.md
index c5fd175b7..372ac5dc7 100644
--- a/doc/Serving_Configure_CN.md
+++ b/doc/Serving_Configure_CN.md
@@ -91,7 +91,7 @@ workdir_9393
 | `model`                                        | str[]| `""`    | Path of paddle model directory to be served           |
 | `mem_optim_off`                                | -    | -       | Disable memory / graphic memory optimization          |
 | `ir_optim`                                     | bool | False   | Enable analysis and optimization of calculation graph |
-| `use_mkl` (Only for cpu version)               | -    | -       | Run inference with MKL                                |
+| `use_mkl` (Only for cpu version)               | -    | -       | Run inference with MKL. Need open with ir_optim.                                |
 | `use_trt` (Only for trt version)               | -    | -       | Run inference with TensorRT. Need open with ir_optim.                           |
 | `use_lite` (Only for Intel x86 CPU or ARM CPU) | -    | -       | Run PaddleLite inference. Need open with ir_optim.                              |
 | `use_xpu`                                      | -    | -       | Run PaddleLite inference with Baidu Kunlun XPU. Need open with ir_optim.        |
@@ -363,7 +363,7 @@ op:
             #计算硬件ID，当devices为""或不写时为CPU预测；当devices为"0", "0,1,2"时为GPU预测，表示使用的GPU卡
             devices: ""
 
-            #use_mkldnn
+            #use_mkldnn, 开启mkldnn时，必须同时设置ir_optim=True，否则无效
             #use_mkldnn: True
 
             #ir_optim，开启TensorRT时，必须同时设置ir_optim=True，否则无效
@@ -401,7 +401,7 @@ op:
             #计算硬件ID，当devices为""或不写时为CPU预测；当devices为"0", "0,1,2"时为GPU预测，表示使用的GPU卡
             devices: ""
 
-            #use_mkldnn
+            #use_mkldnn, 开启mkldnn时，必须同时设置ir_optim=True，否则无效
             #use_mkldnn: True
 
             #ir_optim，开启TensorRT时，必须同时设置ir_optim=True，否则无效
diff --git a/doc/Serving_Configure_EN.md b/doc/Serving_Configure_EN.md
index 4c8ec836a..5edf42c6c 100644
--- a/doc/Serving_Configure_EN.md
+++ b/doc/Serving_Configure_EN.md
@@ -91,7 +91,7 @@ More flags:
 | `model`                                        | str[]| `""`    | Path of paddle model directory to be served           |
 | `mem_optim_off`                                | -    | -       | Disable memory / graphic memory optimization          |
 | `ir_optim`                                     | bool | False   | Enable analysis and optimization of calculation graph |
-| `use_mkl` (Only for cpu version)               | -    | -       | Run inference with MKL                                |
+| `use_mkl` (Only for cpu version)               | -    | -       | Run inference with MKL. Need open with ir_optim.                                |
 | `use_trt` (Only for trt version)               | -    | -       | Run inference with TensorRT. Need open with ir_optim.                            |
 | `use_lite` (Only for Intel x86 CPU or ARM CPU) | -    | -       | Run PaddleLite inference. Need open with ir_optim.                              |
 | `use_xpu`                                      | -    | -       | Run PaddleLite inference with Baidu Kunlun XPU. Need open with ir_optim.        |
@@ -386,7 +386,7 @@ op:
             #Device ID
             devices: ""
 
-            #use_mkldnn
+            #use_mkldnn, When running on mkldnn，must set ir_optim=True
             #use_mkldnn: True
 
             #ir_optim, When running on TensorRT，must set ir_optim=True
@@ -424,7 +424,7 @@ op:
             # device_type, 0=cpu, 1=gpu, 2=tensorRT, 3=arm cpu, 4=kunlun xpu
             device_type: 0
 
-            #use_mkldnn
+            #use_mkldnn, When running on mkldnn，must set ir_optim=True
             #use_mkldnn: True
 
             #ir_optim, When running on TensorRT，must set ir_optim=True