Add an UPDATING entry about the renaming of blocklist.
    
    Approved by:    re (cperciva)
    Approved by:    emaste (mentor)
    Fixes:  7238317403b9 ("blocklist: Rename blacklist to blocklist")
    MFC after:      1 day
    
    (cherry picked from commit ffa8165009365ff93050626d880f2d1d6aacc31a)
    (cherry picked from commit f22ca25404e795aa08efc35d8cdbb5b44304650f)
---
 UPDATING | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/UPDATING b/UPDATING
index 6e893f07df61..4b14159ceb4a 100644
--- a/UPDATING
+++ b/UPDATING
@@ -17,6 +17,12 @@ and/or ports.
 	can install the ftp/freebsd-ftpd port.  pkgbase users should remove
 	the orphaned FreeBSD-ftpd package.
 
+20251012:
+	Blacklist has been renamed upstream to Blocklist.  If you have it
+	configured, rename all configuration files, firewall anchors or
+	sentinel files to reflect the new nomenclature.  Old setups will
+	continue to work emitting a warning.
+
 20251002:
 	Audio-related utilities including mixer(8) and virtual_oss(8) have
 	moved to the new FreeBSD-sound package.  If you have set-optional or