diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
index 2646120..5aaec28 100644
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -4,6 +4,8 @@
   (such as `range_day/3` to get a range of days between a start and end date.
 * Add `beginning_X` functions to return the beginning of the provided precision
   (minute, hour, day, week, month, or year)
++ Add `end_X` functions to return the last second of each time period (this is
+  just the opposite of `beginning_X`)
 * Add `between/[2,3,5]` functions for computing whether a date/time is between
   two others.
 * Update to rebar3 and add hex compatability. (@Licenser)