diff --git a/README.md b/README.md
index 68161fc..e4f325f 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@ Tested and run regularly on Fedora, but should work on other distributions with
 * bash
 * pnmtops (netpbm-progs)
 * ps2pdf (ghostscript)
+* pdfunite
 
 ### Optional