diff --git a/src/convert_M_in_KM.c b/src/convert_M_in_KM.c
index 966872e..cdc37a2 100644
--- a/src/convert_M_in_KM.c
+++ b/src/convert_M_in_KM.c
@@ -1,7 +1,7 @@
 
 #include "convert_M_in_KM.h"
 #include <stdio.h>
-//convert length
+//convert length for double
 double meter_to_kilometer(double meter) {
     return meter / 1000.0;
 }