diff --git a/requirements-dev.txt b/requirements-dev.txt
index af996cf..94640ba 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1 +1,2 @@
-twine
+twine  # PyPI
+grip   # Markdown to PDF
diff --git a/user_guide.pdf b/user_guide.pdf
new file mode 100644
index 0000000..e923445
Binary files /dev/null and b/user_guide.pdf differ