diff --git a/actionview/lib/action_view/helpers/form_tag_helper.rb b/actionview/lib/action_view/helpers/form_tag_helper.rb
index f12d436f8e11628b14526d7cc7255524a83907df..88b8400644af82794912302596d6a4c4632fe74b 100644
--- a/actionview/lib/action_view/helpers/form_tag_helper.rb
+++ b/actionview/lib/action_view/helpers/form_tag_helper.rb
@@ -82,7 +82,7 @@ def form_tag(url_for_options = {}, options = {}, &block)
# ==== Options
# * :multiple - If set to true the selection will allow multiple choices.
# * :disabled - If set to true, the user will not be able to use this input.
- # * :include_blank - If set to true, an empty option will be created.
+ # * :include_blank - If set to true, an empty option will be created. If set to a string, the string will be used as the option's content and the value will be empty.
# * :prompt - Create a prompt option with blank value and the text asking user to select something.
# * :selected - Provide a default selected value. It should be of the exact type as the provided options.
# * Any other key creates standard HTML attributes for the tag.
@@ -116,6 +116,9 @@ def form_tag(url_for_options = {}, options = {}, &block)
# select_tag "people", options_from_collection_for_select(@people, "id", "name"), include_blank: true
# # =>
#
+ # select_tag "people", options_from_collection_for_select(@people, "id", "name"), include_blank: "All"
+ # # =>
+ #
# select_tag "people", options_from_collection_for_select(@people, "id", "name"), prompt: "Select something"
# # =>
#