diff --git a/lib/datagrid/form_builder.rb b/lib/datagrid/form_builder.rb
index f603023..12be3fa 100644
--- a/lib/datagrid/form_builder.rb
+++ b/lib/datagrid/form_builder.rb
@@ -22,7 +22,11 @@ def datagrid_label(filter_or_attribute, text = nil, **options, &block)
       label(filter.name, text || filter.header, **options, &block)
     end
 
-    # @visibility private
+    # @param filter_or_attribute [Datagrid::Filters::BaseFilter, String, Symbol] filter object or filter name
+    # @param options [{Symbol => Object}] HTML attributes to assign to input tag
+    #   * `type` - special attribute the determines an input tag to be made.
+    #     Examples: `text`, `select`, `textarea`, `number`, `date` etc.
+    # @return [String] an input tag for the corresponding filter name
     def datagrid_filter_input(attribute_or_filter, **options, &block)
       filter = datagrid_get_filter(attribute_or_filter)
       options = add_filter_options(filter, **options)