diff --git a/book/source/03-cryptography.md b/book/source/03-cryptography.md
index 71dcf29..58a942a 100644
--- a/book/source/03-cryptography.md
+++ b/book/source/03-cryptography.md
@@ -68,13 +68,6 @@ In many places, we'll deal with asymmetric cryptographic key pairs:
 An asymmetric cryptographic key pair
 ```
 
-```{admonition} VISUAL
-:class: warning
-
-- Wiktor notes: red-green color-blindness affects 8,5% of the population.
-- Heiko: maybe use colors + distinct shapes for the two key halves?
-```
-
 An asymmetric cryptographic key pair consists of a public and a private part. In this document, we'll show the public part of a key pair in green, and the private part in red.
 
 Note that in many contexts, only the public part is present (more on that later):