diff --git a/src/logger.c b/src/logger.c
index 2245887..6776141 100644
--- a/src/logger.c
+++ b/src/logger.c
@@ -16,8 +16,8 @@ void start(char *power_path, char *busid, char *chipaddr);
 
 int main (int argc, char *argv [])
 {
-  if(argc != 2){
-    printf("Usage: %s <sysfs-path>",argv[0]);
+  if(argc != 3){
+    printf("Usage: %s <client> <frequency>",argv[0]);
     exit(1);
   }