diff --git a/.zk/notebook.db b/.zk/notebook.db
index 313b51a..f5f23fd 100644
Binary files a/.zk/notebook.db and b/.zk/notebook.db differ
diff --git a/zk/Push buttons.md b/zk/Push buttons.md
index 0d05137..5f7981d 100644
--- a/zk/Push buttons.md	
+++ b/zk/Push buttons.md	
@@ -21,4 +21,8 @@ To override the switch functionality and just have the button work as a
 connector we would connect the signal-in to the row 23 input and the row 23
 output.
 
+![Push button legs diagram](../img/push-button-legs.png)
+
 ## Related notes
+
+https://projects.raspberrypi.org/en/projects/button-switch-scratch-pi/1