1 files changed, 1 insertions, 0 deletions
diff --git a/src/wiebenik.c b/src/wiebenik.c
index 71b321d..5d71ef4 100644
--- a/src/wiebenik.c
+++ b/src/wiebenik.c
@@ -31,6 +31,7 @@ static char** parse_options(int argc, char **argv) {
         exit(0);
 
       case '?':
+        fprintf(stderr, "wiebenik: Ongeldige optie: -%c\n", optopt);
         usage(stderr);
         exit(1);
     }