diff --git a/src/docs/part1/simple_detector.md b/src/docs/part1/simple_detector.md
index 921f869a3f2e710a27ffb39658a7f6ac9a73af44..1232e239340f4c48b83aecd5e30acaba87d95f6e 100644
--- a/src/docs/part1/simple_detector.md
+++ b/src/docs/part1/simple_detector.md
@@ -325,7 +325,8 @@ This means it will be fast because it only parses the ID specification string on
 
 The statement above selects for the interior layers number 4 and 5:
 Look at the generated plot in `results`:
-![z_position](../z_position.png)
+
+![z_position](../z_position_part1.png)
 
 ## References
 
diff --git a/static/z_positioni_part1.png b/static/z_position_part1.png
similarity index 100%
rename from static/z_positioni_part1.png
rename to static/z_position_part1.png