diff --git a/book/source/04-certificates.md b/book/source/04-certificates.md
index 4ad0ff5..2fbb507 100644
--- a/book/source/04-certificates.md
+++ b/book/source/04-certificates.md
@@ -106,21 +106,25 @@ Subkeys have the same structural attributes as the primary key but fulfill a dif
 OpenPGP certificates can contain multiple subkeys.
 ```
 
-#### Key Flags: defining which operations a component key can perform
+#### Defining operational capabilities with Key Flags
 
 ```{admonition} Warning
 Let's decide whether the capitalization of F is necessary.
 ```
 
-Each component key has a set of ["Key Flags"](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#key-flags) that specify which operations that key can perform.
+Each component key has a set of ["Key Flags"](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-10.html#key-flags) that delineate the operations a key can perform.
 
-The commonly used key flags are:
+Commonly used key flags are:
 
 - **C**ertification (issuing third-party certifications)
 - **S**igning (signing data)
 - **E**ncryption (encrypting data)
 - **A**uthentication (commonly used for OpenPGP authentication)
 
+```{admonition} Warning
+Accessibility. Is the bolding of C, S, E, A compatible with screenreaders? Is it worth the effort?
+```
+
 By convention, only the primary key is allowed to perform "certification" operations. All other operations can be configured on either the primary key or a subkey.
 
 ```{note}