diff --git a/du1/program.c b/du1/program.c
index a7eb860..be5c603 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -19,7 +19,7 @@ if(fgets(line, sizeof(line), stdin) == NULL) {
 
 if (sscanf(line, "%lf", &x) != 1) {
 
-  printf("Invalid input for x.\n");
+  printf("Chyba pri nacitani hodnoty x.\n");
   return 1;
 
 }