diff --git a/doc/release-notes/mzscheme/HISTORY.txt b/doc/release-notes/mzscheme/HISTORY.txt
index 51cfe16b99..ebfcfd7801 100644
--- a/doc/release-notes/mzscheme/HISTORY.txt
+++ b/doc/release-notes/mzscheme/HISTORY.txt
@@ -1,3 +1,7 @@
+Somewhere in there:
+ function contracts now preserve tail recursion in many cases; the
+ 'any' contract is no longer special.
+
 Version 4.1.3.8
 Added procedure-rename
 Added extra arguments to call-with-continuation-prompt