diff --git a/pages/04.other/useful-commands/default.en.md b/pages/04.other/useful-commands/default.en.md
index e7e5e6d..3996565 100644
--- a/pages/04.other/useful-commands/default.en.md
+++ b/pages/04.other/useful-commands/default.en.md
@@ -18,6 +18,22 @@ convert -density 600 {INPUT.PDF} -crop 50x100% +repage {OUT.PDF}
 -crop 50x100%: this splits the pdf into "left" and "right". 100x50% would split into "top" and "bottom"
 ```
 
+## Ghostscript
+
+### Merge multiple PDF files
+
+Ghostscript is preinstalled on a lot of Linux systems and can quite easily be used to merge and optimize multiple PDF files into one.
+
+[shuser]
+
+```sh
+gs -q -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -o merged.pdf <first>.pdf <second>.pdf
+```
+
+[/shuser]
+
+> [Merge / convert multiple PDF files into one PDF](https://stackoverflow.com/a/19358402)
+
 ## Find
 
 ### Change filtered permissions