diff --git a/src/convert_M_in_KM.c b/src/convert_M_in_KM.c
index 4237094..bf56016 100644
--- a/src/convert_M_in_KM.c
+++ b/src/convert_M_in_KM.c
@@ -1,6 +1,6 @@
 #include "convert_M_in_KM.h"
 
-// convert length for double metre into kilometers
+// convert length for double metre into kilometre
 double meter_to_kilometer(double meter) {
     return meter / 1000.0;
 }