diff --git a/arborescence_protocol.png b/arborescence_protocol.png
new file mode 100644
index 0000000000000000000000000000000000000000..8d4df0508037fbe3ac1b320c0179bcdcf5afc40a
Binary files /dev/null and b/arborescence_protocol.png differ
diff --git a/readme.md b/readme.md
index 2bece6f913a758051a83761bd08c9337a0d59883..77a5f22dcd682076802c0bd578f0c9daacb43efc 100644
--- a/readme.md
+++ b/readme.md
@@ -86,8 +86,8 @@ The classifiers are trained between cover images, and new stegos are generated i
 * train.py: definition of the class Fitter useful for training a classifier.
 
 
-![GitHub Logo](arborescence_protocol.pdf)
-Format: ![Alt Text](url)
+![arborescence](arborescence_protocol.png)
+