diff --git a/merge-pdf/README.md b/merge-pdf/README.md
index 58975a7..98e9d0f 100644
--- a/merge-pdf/README.md
+++ b/merge-pdf/README.md
@@ -5,3 +5,7 @@ Just a simple command line tool to merge multiple pdf files
 #### Requirements
 
 - `ghostscript`
+
+#### Usage
+
+`./merge-pdf.sh -o <output file> [files to merge]`