diff --git a/mj2/frames_to_mj2.c b/mj2/frames_to_mj2.c
index d8635eed..8b6a4653 100644
--- a/mj2/frames_to_mj2.c
+++ b/mj2/frames_to_mj2.c
@@ -86,10 +86,10 @@ void help_display()
     ("Required Parameters (except with -h):\n");
   printf("\n");
   printf
-    ("-i           : source file  (-i source.pnm also *.pgm, *.ppm) \n");
+    ("-i           : source file  (-i source.yuv) \n");
   printf("\n");
   printf
-    ("-o           : destination file (-o dest.j2k or .jp2) \n");
+    ("-o           : destination file (-o dest.mj2) \n");
   printf("\n");
   printf
     ("Optional Parameters:\n");