diff --git a/book/source/02-highlevel.md b/book/source/02-highlevel.md
index d63f4c6..ea79722 100644
--- a/book/source/02-highlevel.md
+++ b/book/source/02-highlevel.md
@@ -55,7 +55,7 @@ The following statement does not make sense here in the history part.
 
 ### OpenPGP version 4
 
-In 2007, the IETF published [RFC 4880](https://datatracker.ietf.org/doc/html/rfc4880), which defined version 4 of the OpenPGP standard. At this time, version 4 is the most commonly used version.
+In 2007, the IETF published [RFC 4880](https://datatracker.ietf.org/doc/html/rfc4880), which defined version 4 of the OpenPGP standard. As of late 2023, version 4 is the most commonly used version.
 
 
 ### Major implementations of OpenPGP