diff --git a/CHANGES b/CHANGES
index de1cb32ed..cded37f01 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,12 @@
 Release 1.4.6 (in development)
 ==============================
 
+Incompatible changes
+--------------------
+
+* #2867: linkcheck builder crashes with six-1.4.  Now Sphinx depends on six-1.5 or
+  later
+
 Bugs fixed
 ----------