diff --git a/mace/benchmark/benchmark_model.cc b/mace/benchmark/benchmark_model.cc
index 7317b8bef6447eb64b6c3ddb55ad0e4509abfc29..b6cd2d699ed92c21dd39742cdeb6b5c906159b7f 100644
--- a/mace/benchmark/benchmark_model.cc
+++ b/mace/benchmark/benchmark_model.cc
@@ -201,7 +201,9 @@ DEFINE_int32(cpu_affinity_policy, 1,
 int Main(int argc, char **argv) {
   MACE_CHECK(FLAGS_device != "HEXAGON",
              "Model benchmark tool do not support DSP.");
-  gflags::SetUsageMessage("some usage message");
+  std::string usage = "benchmark model\nusage: " + std::string(argv[0])
+      + " [flags]";
+  gflags::SetUsageMessage(usage);
   gflags::ParseCommandLineFlags(&argc, &argv, true);
 
   LOG(INFO) << "Model name: [" << FLAGS_model_name << "]";
diff --git a/mace/benchmark/model_throughput_test.cc b/mace/benchmark/model_throughput_test.cc
index fd19be5ca7063d2a7a19e1d61423ef5cb517a1a3..dce0a73616b59fdb1b70cb797bc7bcad26fc3c4c 100644
--- a/mace/benchmark/model_throughput_test.cc
+++ b/mace/benchmark/model_throughput_test.cc
@@ -163,7 +163,9 @@ DEFINE_string(dsp_model_data_file, "", "dsp model data file name");
 DEFINE_int32(run_seconds, 10, "run seconds");
 
 int Main(int argc, char **argv) {
-  gflags::SetUsageMessage("some usage message");
+  std::string usage = "model throughput test\nusage: " + std::string(argv[0])
+      + " [flags]";
+  gflags::SetUsageMessage(usage);
   gflags::ParseCommandLineFlags(&argc, &argv, true);
 
   LOG(INFO) << "mace version: " << MaceVersion();
diff --git a/mace/core/testing/test_benchmark_main.cc b/mace/core/testing/test_benchmark_main.cc
index a2dccb65437b7e3dfde03493e4033af50c8508d4..014a2b826806ec29fccc0e527e4f83975dbfc8b5 100644
--- a/mace/core/testing/test_benchmark_main.cc
+++ b/mace/core/testing/test_benchmark_main.cc
@@ -27,7 +27,9 @@ DEFINE_int32(cpu_affinity_policy, 1,
              "0:AFFINITY_NONE/1:AFFINITY_BIG_ONLY/2:AFFINITY_LITTLE_ONLY");
 
 int main(int argc, char **argv) {
-  gflags::SetUsageMessage("some usage message");
+  std::string usage = "run ops benchmark\nusage: " + std::string(argv[0])
+      + " [flags]";
+  gflags::SetUsageMessage(usage);
   gflags::ParseCommandLineFlags(&argc, &argv, true);
 
   // config runtime
diff --git a/mace/examples/example.cc b/mace/examples/example.cc
index c54f3c504af23413488a648a0f08534bdf3f32d4..27b7d78708c4094e92a9caf8b533ba1745c515c5 100644
--- a/mace/examples/example.cc
+++ b/mace/examples/example.cc
@@ -258,7 +258,9 @@ bool RunModel(const std::vector<std::string> &input_names,
 }
 
 int Main(int argc, char **argv) {
-  gflags::SetUsageMessage("some usage message");
+  std::string usage = "example run\nusage: " + std::string(argv[0])
+      + " [flags]";
+  gflags::SetUsageMessage(usage);
   gflags::ParseCommandLineFlags(&argc, &argv, true);
 
   LOG(INFO) << "mace version: " << MaceVersion();
diff --git a/mace/tools/validation/mace_run.cc b/mace/tools/validation/mace_run.cc
index 17623ab4093152503b35855cb314d6a498083235..ac524e41c164fa47923e66eda1b9727f1b3d5d98 100644
--- a/mace/tools/validation/mace_run.cc
+++ b/mace/tools/validation/mace_run.cc
@@ -423,7 +423,9 @@ bool RunModel(const std::string &model_name,
 }
 
 int Main(int argc, char **argv) {
-  gflags::SetUsageMessage("some usage message");
+  std::string usage = "mace run model\nusage: " + std::string(argv[0])
+      + " [flags]";
+  gflags::SetUsageMessage(usage);
   gflags::ParseCommandLineFlags(&argc, &argv, true);
 
   LOG(INFO) << "model name: " << FLAGS_model_name;