diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index f02b377832ae2d60c58cc83404b7904caa30f650..517db0d2225c09c8a8a308254f23b0b0c1f6ee73 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -3320,7 +3320,25 @@ date.end_of_hour # => Mon Jun 07 19:59:59 +0200 2010
 
 `beginning_of_hour` is aliased to `at_beginning_of_hour`.
 
-INFO: `beginning_of_hour` and `end_of_hour` are implemented for `Time` and `DateTime` but **not** `Date` as it does not make sense to request the beginning or end of an hour on a `Date` instance.
+##### `beginning_of_minute`, `end_of_minute`
+
+The method `beginning_of_minute` returns a timestamp at the beginning of the minute (hh:mm:00):
+
+```ruby
+date = DateTime.new(2010, 6, 7, 19, 55, 25)
+date.beginning_of_minute # => Mon Jun 07 19:55:00 +0200 2010
+```
+
+The method `end_of_minute` returns a timestamp at the end of the minute (hh:mm:59):
+
+```ruby
+date = DateTime.new(2010, 6, 7, 19, 55, 25)
+date.end_of_minute # => Mon Jun 07 19:55:59 +0200 2010
+```
+
+`beginning_of_minute` is aliased to `at_beginning_of_minute`.
+
+INFO: `beginning_of_hour`, `end_of_hour`, `beginning_of_minute` and `end_of_minute` are implemented for `Time` and `DateTime` but **not** `Date` as it does not make sense to request the beginning or end of an hour or minute on a `Date` instance.
 
 ##### `ago`, `since`