diff --git a/bin/dither.c b/bin/dither.c
index e03ea79..08a0f11 100644
--- a/bin/dither.c
+++ b/bin/dither.c
@@ -30,7 +30,7 @@ static void usage(int argc, char **argv, const char *message, ...) {
          fprintf(stderr, "\n");
     }
 
-    fprintf(stderr, "usage: %1$s convert input.png output.png\n", argv[0]);
+    fprintf(stderr, "usage: %1$s dither input.png output.png\n", argv[0]);
 
     exit(1);
 }