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-rw-r--r--actionpack/lib/action_view/helpers/form_helper.rb6
1 files changed, 5 insertions, 1 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 4e1927a897..a59829b23f 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -655,7 +655,11 @@ module ActionView
# <% end %>
#
# because parameter name repetition is precisely what Rails seeks to distinguish
- # the elements of the array.
+ # the elements of the array. For each item with a checked check box you
+ # get an extra ghost item with only that attribute, assigned to "0".
+ #
+ # In that case it is preferable to either use +check_box_tag+ or to use
+ # hashes instead of arrays.
#
# ==== Examples
# # Let's say that @post.validated? is 1: