diff --git a/README.adoc b/README.adoc
index 69fc940..e769b2b 100644
--- a/README.adoc
+++ b/README.adoc
@@ -409,7 +409,7 @@ where:
 
 This format is selected by the following boot options:
 
-* `console_msg_format=syslog`: add the `<LEVEL>` part
+* `console_msg_format=syslog`: add the `<LEVEL>` part. Added in v4.16.
 * `printk.time=y`: add the `[TIMESTAMP]` part
 
 Scroll up in <<graphic-mode>>: