diff --git a/onnxruntime/test/perftest/README.md b/onnxruntime/test/perftest/README.md
index 7ddaa3dad2..5e04e8b324 100644
--- a/onnxruntime/test/perftest/README.md
+++ b/onnxruntime/test/perftest/README.md
@@ -1,25 +1,63 @@
 # ONNXRuntime Performance Test
 
-onnxruntime_perf_test [options...] model_path result_file
+This tool provides the performance results using the ONNX Runtime with the specific execution provider to run the inference for a given model using the sample input test data. This tool can provide a reliable measurement for the inference latency usign ONNX Runtime on the device. The options to use with the tool are listed below:
+
+`onnxruntime_perf_test [options...] model_path result_file`
+
 Options:
-        -m [test_mode]: Specifies the test mode. Value coulde be 'duration' or 'times'.
-                Provide 'duration' to run the test for a fix duration, and 'times' to repeated for a certain times. Default:'duration'.
-        -e [cpu|cuda|mkldnn|tensorrt|ngraph|nuphar]: Specifies the provider 'cpu','cuda','mkldnn','tensorrt','ngraph' or 'nuphar'. Default:'cpu'.
-        -r [repeated_times]: Specifies the repeated times if running in 'times' test mode.Default:1000.
-        -t [seconds_to_run]: Specifies the seconds to run for 'duration' mode. Default:600.
-        -p [profile_file]: Specifies the profile name to enable profiling and dump the profile data to the file.
-        -s: Show statistics result, like P75, P90.
-        -v: Show verbose information.
-        -x: Use parallel executor, default (without -x): sequential executor.
-        -h: help
+
+	-A: Disable memory arena.
+	
+	-M: Disable memory pattern.
+	
+	-P: Use parallel executor instead of sequential executor.
+	
+	-c: [parallel runs]: Specifies the (max) number of runs to invoke simultaneously. Default:1.
+	
+	-e: [cpu|cuda|mkldnn|tensorrt|ngraph|openvino|nuphar]: Specifies the execution provider 'cpu','cuda','mkldnn','tensorrt', 'ngraph', 'openvino' or 'nuphar'. Default is 'cpu'.
+        
+	-m: [test_mode]: Specifies the test mode. Value coulde be 'duration' or 'times'. Provide 'duration' to run the test for a fix duration, and 'times' to repeated for a certain times. Default:'duration'.
+        
+	-o: [optimization level]: Default is 1. Valid values are 0 (disable), 1 (basic), 2 (extended), 99 (all). Please see __onnxruntime_c_api.h__ (enum GraphOptimizationLevel) for the full list of all optimization levels.
+	
+	-p: [profile_file]: Specifies the profile name to enable profiling and dump the profile data to the file.
+	
+	-r: [repeated_times]: Specifies the repeated times if running in 'times' test mode.Default:1000.
+        
+	-s: Show statistics result, like P75, P90.
+
+	-t: [seconds_to_run]: Specifies the seconds to run for 'duration' mode. Default:600.
+        
+	-v: Show verbose information.
+        
+	-x: [intra_op_num_threads]: Sets the number of threads used to parallelize the execution within nodes. A value of 0 means the test will auto-select a default. Must >=0.
+	
+	-y: [inter_op_num_threads]: Sets the number of threads used to parallelize the execution of the graph (across nodes), A value of 0 means the test will auto-select a default. Must >=0.
+	
+	-h: help.
 
 Model path and input data dependency:
-    Performance test uses the same input structure as onnx_test_runner. It requrires the directory trees as below:
+    Performance test uses the same input structure as *onnx_test_runner* tool. It requrires the directory trees as below:
 
     --ModelName
         --test_data_set_0
             --input0.pb
         --test_data_set_2
-	        --input0.pb
+            --input0.pb
         --model.onnx
-    The path of model.onnx needs to be provided as <model_path> argument.
+    
+The path of model.onnx needs to be provided as `<model_path>` argument.
+
+__Sample output__ from the tool will look something like this:
+
+	Total time cost:58.8053
+	Total iterations:1000
+	Average time cost:58.8053 ms
+	Total run time:58.8102 s
+	Min Latency is 0.0559777sec
+	Max Latency is 0.0623472sec
+	P50 Latency is 0.0587108sec
+	P90 Latency is 0.0599845sec
+	P95 Latency is 0.0605676sec
+	P99 Latency is 0.0619517sec
+	P999 Latency is 0.0623472se