diff --git a/Tools/tga_applymap.c b/Tools/tga_applymap.c
index d49dd76..18bee8a 100644
--- a/Tools/tga_applymap.c
+++ b/Tools/tga_applymap.c
@@ -16,7 +16,7 @@ fprintf(stderr, "* tga_applymap v 0.0.14 [%s] (dwtfywl) Krabulator 1910\n",
 fprintf(stderr, "  compiled %s at %s\n", __DATE__, __TIME__);
 
 fprintf(stderr, "Usage:\n\ttga_applymap M src.tga color.map dst.tga\n");
-fprintf(stderr, "       M is 1 or 2\n");
+fprintf(stderr, "       M is 1 (color mode) or 2 (gray mode)\n");
 if (flag) Image_print_version(0);
 exit(5);
 }