diff --git a/History.markdown b/History.markdown
index 44c8c4ff..75ab92c9 100644
--- a/History.markdown
+++ b/History.markdown
@@ -9,6 +9,7 @@
   * Docs: remove duplicate "available" (#6380)
   * Docs: GitHub Pages instructions (#6384)
   * Improve documentation for theme-gem installation (#6387)
+  * Fix diff syntax-highlighting (#6388)
 
 ### Development Fixes