1 files changed, 1 insertions, 0 deletions
diff --git a/src/omd.c b/src/omd.c
index 2291a6c..71b8dee 100644
--- a/src/omd.c
+++ b/src/omd.c
@@ -29,6 +29,7 @@ static char** parse_options(int argc, char **argv) {
         exit(0);
 
       case '?':
+        fprintf(stderr, "omd: Ongeldige optie: -%c\n", optopt);
         usage(stderr);
         exit(1);
     }