diff --git a/activerecord/lib/active_record/counter_cache.rb b/activerecord/lib/active_record/counter_cache.rb
index c53b7b3e78cc528d22a8160f33c8199e276f1b1e..4c5326ead6fe8fe493636768738a2aab7007c13d 100644
--- a/activerecord/lib/active_record/counter_cache.rb
+++ b/activerecord/lib/active_record/counter_cache.rb
@@ -88,7 +88,7 @@ def update_counters(id, counters)
       # ==== Parameters
       #
       # * +counter_name+ - The name of the field that should be incremented.
-      # * +id+ - The id of the object that should be incremented.
+      # * +id+ - The id of the object that should be incremented or an Array of ids.
       #
       # ==== Examples
       #
@@ -105,7 +105,7 @@ def increment_counter(counter_name, id)
       # ==== Parameters
       #
       # * +counter_name+ - The name of the field that should be decremented.
-      # * +id+ - The id of the object that should be decremented.
+      # * +id+ - The id of the object that should be decremented or an Array of ids.
       #
       # ==== Examples
       #