diff --git a/History.markdown b/History.markdown
index 6f0ea19ec..665982a82 100644
--- a/History.markdown
+++ b/History.markdown
@@ -14,6 +14,7 @@
   * Add jekyll-toc plugin (#4429)
   * Docs: Quickstart - added documentation about the `--force` option (#4410)
   * Fix broken links to the Code of Conduct (#4436)
+  * upgrade notes: mention trailing slash in permalink; fixes #4440 (#4455)
 
 ## 3.1.1 / 2016-01-29