diff --git a/book/source/17-zoom_certificates.md b/book/source/17-zoom_certificates.md
index 9080153..78dc2a5 100644
--- a/book/source/17-zoom_certificates.md
+++ b/book/source/17-zoom_certificates.md
@@ -44,20 +44,10 @@ alice.pub-8--PublicSubkey
 alice.pub-9--Signature
 ```
 
-```{admonition} VISUAL
-:class: warning
 
-Show a very abstract diagram of the packets of Alice's OpenPGP certificate (above):
-- Public-Key packet
-- Direct Key Signature
-- User ID
-- Certifying self-signature for User ID
-- Public-Subkey packet
-- Subkey binding signature
-- Public-Subkey packet
-- Subkey binding signature
-- Public-Subkey packet
-- Subkey binding signature
+```{figure} diag/certificate_packet_list.png
+
+Overview of the packets in Alice's OpenPGP certificate 
 ```
 
 ### Joining packets into an OpenPGP certificate
diff --git a/book/source/diag/certificate_packet_list.png b/book/source/diag/certificate_packet_list.png
new file mode 100644
index 0000000..4202fdb
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