diff --git a/files/command_help b/files/command_help
index f58f77d..4c4686c 100644
--- a/files/command_help
+++ b/files/command_help
@@ -56,3 +56,6 @@ pdftk <pdf-file> output fixed<original_filename>
 ##convert
 #PDF - in TIFF Plätten
 convert <pdf-file> <original_filename>.tiff
+
+#PDF - Version Downgrade
+gs -sDEVICE=pdfwrite -dCompatibilityLevel=<VERSION> -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf