Noting jenkins-infra/update-center2#376

README.md

@@ -142,7 +142,7 @@ The CI build (or just `mvn test -P2.nnn.x`) will fail if some managed plugins ar
 [This script](https://gist.github.com/jglick/0a85759ea65f60e107ac5a85a5032cae)
 is a handy way to find the most recently released plugin version compatible with a given line,
 according to the `jenkins-infra/update-center2`.
-The UC currently maintains releases for the past five lines,
+The UC currently maintains releases for the [past 400 days](https://groups.google.com/g/jenkins-infra/c/LTrRUqkgeQA/m/UmQMD5gDAgAJ)
 so it is reasonable to retire BOMs for lines older than that.
 
 ## Releasing