diff --git a/Release-Process.md b/Release-Process.md
index db4c6ed..31bc5db 100644
--- a/Release-Process.md
+++ b/Release-Process.md
@@ -17,7 +17,7 @@ Update the `pdfjs.config` file:
     1. Call the release and tag `v{version}` and insert the version from the name of the ZIP file.
     1. Attach the ZIP file from the step above and include release notes
         1. Clone https://github.com/brendandahl/pdf.js.utils
-        2. Run `release.py`
+        2. Run `python2 release.py {last_pr_number}`, where `{last_pr_number}` is the last PR number (without hash) in the release notes of the existing release
     1. Label the existing release as stable
     1. Label the new release as pre-release
 1. Update `pdfjs.config` to bump both the stable and beta version numbers