diff --git a/History.markdown b/History.markdown
index 1706488a..ca32d80e 100644
--- a/History.markdown
+++ b/History.markdown
@@ -10,6 +10,7 @@
 
   * Site template: Escape title and description where it is used in HTML (#4606)
   * Document#date: drafts which have no date should use source file mtime (#4611)
+  * Filters#time: clone an input Time so as to be non-destructive (#4590)
 
 ### Development Fixes