diff --git a/src/nvidia_gpu.h b/src/nvidia_gpu.h
index 681a028f30609c1c9af5f4729778b787c324c788..1f3d053d0e4513ee707d7e4658e8a0a7774fe54c 100644
--- a/src/nvidia_gpu.h
+++ b/src/nvidia_gpu.h
@@ -38,6 +38,6 @@ Optparse nvidia_gpu_opt[1] = {
         .shortname = 'n',
         .argtype = OPTPARSE_NONE,
         .usage_arg = NULL,
-        .usage_msg = "provides basic gpu information",
+        .usage_msg = "provides basic gpu information [clocks, memory, utilization, power, temperature].",
     },
 };