1 files changed, 1 insertions, 0 deletions
diff --git a/src/ja.c b/src/ja.c
index 6b37b02..3d6135d 100644
--- a/src/ja.c
+++ b/src/ja.c
@@ -30,6 +30,7 @@ static char** parse_options(int argc, char **argv) {
         exit(0);
 
       case '?':
+        fprintf(stderr, "ja: Ongeldige optie: -%c\n", optopt);
         usage(stderr);
         exit(1);
     }