1 files changed, 1 insertions, 0 deletions
diff --git a/src/spons.c b/src/spons.c
index f59bd25..51bb109 100644
--- a/src/spons.c
+++ b/src/spons.c
@@ -36,6 +36,7 @@ static char** parse_options(int argc, char **argv, bool *a) {
         exit(0);
 
       case '?':
+        fprintf(stderr, "spons: Ongeldige optie: -%c\n", optopt);
         usage(stderr);
         exit(1);
     }