1 files changed, 27 insertions, 7 deletions
diff --git a/guides/source/active_support_core_extensions.md b/guides/source/active_support_core_extensions.md
index ae2e1faf14..057651e0cf 100644
--- a/guides/source/active_support_core_extensions.md
+++ b/guides/source/active_support_core_extensions.md
@@ -2039,6 +2039,21 @@ WARNING. Keys should normally be unique. If the block returns the same value for
 
 NOTE: Defined in `active_support/core_ext/enumerable.rb`.
 
+### `index_with`
+
+The method `index_with` generates a hash with the elements of an enumerable as keys. The value
+is either a passed default or returned in a block.
+
+```ruby
+%i( title body created_at ).index_with { |attr_name| public_send(attr_name) }
+# => { title: "hey", body: "what's up?", … }
+
+WEEKDAYS.index_with([ Interval.all_day ])
+# => { monday: [ 0, 1440 ], … }
+```
+
+NOTE: Defined in `active_support/core_ext/enumerable.rb`.
+
 ### `many?`
 
 The method `many?` is shorthand for `collection.size > 1`:
@@ -2874,9 +2889,9 @@ As the example depicts, the `:db` format generates a `BETWEEN` SQL clause. That
 
 NOTE: Defined in `active_support/core_ext/range/conversions.rb`.
 
-### `include?`
+### `===`, `include?`, and `cover?`
 
-The methods `Range#include?` and `Range#===` say whether some value falls between the ends of a given instance:
+The methods `Range#===`, `Range#include?`, and `Range#cover?` say whether some value falls between the ends of a given instance:
 
 ```ruby
 (2..3).include?(Math::E) # => true
@@ -2885,18 +2900,23 @@ The methods `Range#include?` and `Range#===` say whether some value falls betwee
 Active Support extends these methods so that the argument may be another range in turn. In that case we test whether the ends of the argument range belong to the receiver themselves:
 
 ```ruby
+(1..10) === (3..7)  # => true
+(1..10) === (0..7)  # => false
+(1..10) === (3..11) # => false
+(1...9) === (3..9)  # => false
+
 (1..10).include?(3..7)  # => true
 (1..10).include?(0..7)  # => false
 (1..10).include?(3..11) # => false
 (1...9).include?(3..9)  # => false
 
-(1..10) === (3..7)  # => true
-(1..10) === (0..7)  # => false
-(1..10) === (3..11) # => false
-(1...9) === (3..9)  # => false
+(1..10).cover?(3..7)  # => true
+(1..10).cover?(0..7)  # => false
+(1..10).cover?(3..11) # => false
+(1...9).cover?(3..9)  # => false
 ```
 
-NOTE: Defined in `active_support/core_ext/range/include_range.rb`.
+NOTE: Defined in `active_support/core_ext/range/compare_range.rb`.
 
 ### `overlaps?`