diff --git a/History.markdown b/History.markdown
index 7997d061..00dc1a03 100644
--- a/History.markdown
+++ b/History.markdown
@@ -18,6 +18,7 @@
   * Added basic microdata to post template in site template (#3189)
   * Store log messages in an array of messages. (#3244)
   * Allow collection documents to override `output` property in front matter (#3172)
+  * Keep file modification times between builds for static files (#3220)
 
 ### Bug Fixes