diff --git a/daq.c b/daq.c
index 9a3bdef..dade486 100644
--- a/daq.c
+++ b/daq.c
@@ -40,7 +40,7 @@ int main(int argc, char *argv[]){
 
     if(argc!=3){
         printf("Invalid number of arguments,\n"\
-        "Usage: daq <time(h)> <sampling period(s)>\nexiting!\n");
+        "Usage: daq <daq duration(h)> <sampling period(s)>\nexiting!\n");
         return -2;
     }