1 files changed, 1 insertions, 0 deletions
diff --git a/src/weerklank.c b/src/weerklank.c
index 477aef4..ad03389 100644
--- a/src/weerklank.c
+++ b/src/weerklank.c
@@ -45,6 +45,7 @@ static char** parse_options(int argc, char **argv, struct options *opts) {
         exit(0);
 
       case '?':
+        fprintf(stderr, "weerklank: Ongeldige optie: -%c\n", optopt);
         usage(stderr);
         exit(1);
     }