From 7e97d44caf9820ce1a1caf012b09ed738a0f4cf4 Mon Sep 17 00:00:00 2001
From: kojix2 <2xijok@gmail.com>
Date: Sat, 29 May 2021 10:28:56 +0900
Subject: [PATCH] Add comments

---
 lib/youplot/backends/unicode_plot.rb | 3 +++
 lib/youplot/options.rb               | 1 +
 lib/youplot/parameters.rb            | 3 +--
 lib/youplot/parser.rb                | 1 +
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/youplot/backends/unicode_plot.rb b/lib/youplot/backends/unicode_plot.rb
index f99b878..4a9fcf3 100644
--- a/lib/youplot/backends/unicode_plot.rb
+++ b/lib/youplot/backends/unicode_plot.rb
@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# UnicodePlot - Plot your data by Unicode characters
+# https://github.com/red-data-tools/unicode_plot.rb
+
 require_relative 'processing'
 require 'unicode_plot'
 
diff --git a/lib/youplot/options.rb b/lib/youplot/options.rb
index a50c202..1fb2a3d 100644
--- a/lib/youplot/options.rb
+++ b/lib/youplot/options.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 module YouPlot
+  # Command line options that are not Plot parameters
   Options = Struct.new(
     :delimiter,
     :transpose,
diff --git a/lib/youplot/parameters.rb b/lib/youplot/parameters.rb
index 4c35b4b..9a9da6f 100644
--- a/lib/youplot/parameters.rb
+++ b/lib/youplot/parameters.rb
@@ -2,8 +2,7 @@
 
 module YouPlot
   # UnicodePlot parameters.
-  # * Normally in a Ruby program, you might use hash for the parameter object.
-  # * Here, I use Struct for 2 safety reason.
+  # Why Struct, not Hash?
   # * The keys are static in Struct.
   # * Struct does not conflict with keyword arguments. Hash dose.
   Parameters = Struct.new(
diff --git a/lib/youplot/parser.rb b/lib/youplot/parser.rb
index 98246b8..2c90c4c 100644
--- a/lib/youplot/parser.rb
+++ b/lib/youplot/parser.rb
@@ -4,6 +4,7 @@ require 'optparse'
 require_relative 'options'
 
 module YouPlot
+  # Class for parsing command line options
   class Parser
     class Error < StandardError; end