diff --git a/UPDATING b/UPDATING
index 30e9968351ce..7610c6df80f3 100644
--- a/UPDATING
+++ b/UPDATING
@@ -51,6 +51,11 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
 
 ****************************** SPECIAL WARNING: ******************************
 
+20161124:
+	Clang, llvm, lldb, compiler-rt and libc++ have been upgraded to 3.9.0.
+	Please see the 20141231 entry below for information about prerequisites
+	and upgrading, if you are not already using clang 3.5.0 or higher.
+
 20161119:
 	The layout of the pmap structure has changed for powerpc to put the pmap
 	statistics at the front for all CPU variations.  libkvm(3) and all tools