diff --git a/History.markdown b/History.markdown
index 3b4c0846..49068878 100644
--- a/History.markdown
+++ b/History.markdown
@@ -18,6 +18,7 @@
   * Convertible: set self.output in #render_all_layouts and #do_layout (#5337)
   * Only complain about `kramdown.coderay` if it is actually in the config (#5380)
   * Clarify documentation in theme gem's README template (#5376)
+  * Allow underscore in highlighter language (#5375)
 
 ### Site Enhancements