diff --git a/src/mechanize/file.cr b/src/mechanize/file.cr
index 02539b4..900d239 100644
--- a/src/mechanize/file.cr
+++ b/src/mechanize/file.cr
@@ -1,9 +1,15 @@
 require "http/client"
 
 class Mechanize
-  class File
-    # property :body, :filename
-    property :body, :code, uri, :response
+  abstract class File
+    # property :filename
+
+    # returns http response body
+    getter body : String
+    # returns http status code
+    getter code : Int32
+    # returns page uri
+    getter uri  : URI
 
     def initialize(uri : URI, response : ::HTTP::Client::Response, body : String, code : Int32)
       @uri = uri
diff --git a/src/mechanize/form.cr b/src/mechanize/form.cr
index a993e3d..a868ec1 100644
--- a/src/mechanize/form.cr
+++ b/src/mechanize/form.cr
@@ -13,7 +13,7 @@ class Mechanize::Form
   include Mechanize::ElementMatcher
 
   getter node : Node | Lexbor::Node
-  # returns an array of `Mechanize::FormContent::Field` in the form.
+  # returns hoge array of `Mechanize::FormContent::Field` in the form.
   getter fields : Array(FormContent::Field)
   # returns an array of input tags whose type is checkbox in the form.
   getter checkboxes : Array(FormContent::CheckBox)
@@ -23,11 +23,16 @@ class Mechanize::Form
   getter selectboxes : Array(FormContent::MultiSelectList)
   # returns an array of button tags and input tag whose type is button,submit,reset,image.
   getter buttons : Array(FormContent::Button)
+  # returns form's 'enctype' attribute.
   getter enctype : String
+  # returns form's 'method' attribute.
   getter method : String
+  # returns form's 'name' attribute.
   getter name : String
-  getter page : Mechanize::Page?
+  # return form's 'action' attribute.
   property action : String
+  # returns the page which includes the form.
+  getter page : Mechanize::Page?
 
   def initialize(node : Node | Lexbor::Node, page : Mechanize::Page? = nil)
     @enctype = node.fetch("enctype", "application/x-www-form-urlencoded")
diff --git a/src/mechanize/utils/element_matcher.cr b/src/mechanize/utils/element_matcher.cr
index f36d262..4acd692 100644
--- a/src/mechanize/utils/element_matcher.cr
+++ b/src/mechanize/utils/element_matcher.cr
@@ -6,7 +6,7 @@ class Mechanize
       # 
       # Examples
       # ```
-      # # if you specify String like "foo", it searches form which name is "foo".
+      # # if you specify String like "foo", it searches {{ singular.id }} which name is "foo".
       {% if ["form", "button"].includes?("#{singular.id}") %}
         # # like <{{ singular.id }} name="foo"></{{ singular.id }}>
       {% elsif "#{singular.id}" == "field" %}