diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
index 7433ebff7380..837286af388b 100644
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -38,7 +38,7 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
-# 2018mmdd: new clang import which bumps version from 6.0.1 to 7.0.1.
+# 20181218: new clang import which bumps version from 6.0.1 to 7.0.1.
 OLD_FILES+=usr/lib/clang/6.0.1/include/sanitizer/allocator_interface.h
 OLD_FILES+=usr/lib/clang/6.0.1/include/sanitizer/asan_interface.h
 OLD_FILES+=usr/lib/clang/6.0.1/include/sanitizer/common_interface_defs.h
diff --git a/UPDATING b/UPDATING
index cafea901310f..17c9f6c5a3ba 100644
--- a/UPDATING
+++ b/UPDATING
@@ -31,6 +31,12 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
 	disable the most expensive debugging functionality run
 	"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
 
+20181218:
+	Clang, llvm, lld, lldb, compiler-rt and libc++ have been upgraded to
+	7.0.1.  Please see the 20141231 entry below for information about
+	prerequisites and upgrading, if you are not already using clang 3.5.0
+	or higher.
+
 20181126:
 	On amd64, arm64 and armv7 (architectures that install LLVM's ld.lld
 	linker as /usr/bin/ld) GNU ld is no longer installed as ld.bfd, as