diff --git a/reactos/tools/cdmake/readme.txt b/reactos/tools/cdmake/readme.txt
index fd0301b30f8..4ddb07389eb 100644
--- a/reactos/tools/cdmake/readme.txt
+++ b/reactos/tools/cdmake/readme.txt
@@ -40,7 +40,7 @@ image.
 
 The utility is called up by a command line of the following form:
 
-     CDMAKE  [-q] [-v] [-p] [-s N] [-m] [-b bootimage]  source  volume  image
+     CDMAKE  [-q] [-v] [-p] [-s N] [-m] [-j] [-b bootimage]  source  volume  image
 
      source        specifications of base directory containing all files to
                    be written to CD-ROM image
@@ -62,6 +62,8 @@ The utility is called up by a command line of the following form:
      -m            accept punctuation marks other than underscores in
                    names and extensions
 
+     -j            generates Joliet filename records
+
      -b bootimage  create bootable ElTorito CD-ROM using 'no emulation' mode