diff --git a/docs/_static/exercise.png b/docs/_static/exercise.png
deleted file mode 100644
index 8528779..0000000
Binary files a/docs/_static/exercise.png and /dev/null differ
diff --git a/docs/exercise.rst b/docs/exercise.rst
index 1e6735f..505bde7 100644
--- a/docs/exercise.rst
+++ b/docs/exercise.rst
@@ -36,9 +36,9 @@ role of cybersecurity experts for an organization with a technical environment s
 to the hacked power plant infrastructure. Red boxes are used to indicate assets impacted
 during the campaign.
 
-.. figure:: ./_static/exercise.png
+.. figure:: ./_static/ref_arch.png
   :align: center
-  :scale: 90%
+  :scale: 25%
 
   Reference Architecture (Click to enlarge)