diff --git a/ddia-cover.png b/ddia-cover.png
index 62dee30..e082f66 100644
Binary files a/ddia-cover.png and b/ddia-cover.png differ
diff --git a/ddia-sample.epub b/ddia-sample.epub
new file mode 100644
index 0000000..75ff248
Binary files /dev/null and b/ddia-sample.epub differ
diff --git a/ddia-sample.pdf b/ddia-sample.pdf
new file mode 100644
index 0000000..ea2a4ec
Binary files /dev/null and b/ddia-sample.pdf differ