diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 9835733b17..76342f7108 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Add method `dig` to `session`.
+
+    *claudiob*, *Takumi Shotoku*
+
 *   Controller level `force_ssl` has been deprecated in favor of
     `config.force_ssl`.
 
diff --git a/actionpack/lib/action_dispatch/request/session.rb b/actionpack/lib/action_dispatch/request/session.rb
index 2ff651fc31..bc5e0670e0 100644
--- a/actionpack/lib/action_dispatch/request/session.rb
+++ b/actionpack/lib/action_dispatch/request/session.rb
@@ -93,8 +93,8 @@ module ActionDispatch
         @delegate[key.to_s]
       end
 
-      # Returns the nested value specified by the sequence of key, returning
-      # nil if any intermediate step is nil.
+      # Returns the nested value specified by the sequence of keys, returning
+      # +nil+ if any intermediate step is +nil+.
       def dig(*keys)
         load_for_read!
         keys = keys.map.with_index { |key, i| i.zero? ? key.to_s : key }