From d7e49f048fb116bd51bbe3ed126dd3919b419648 Mon Sep 17 00:00:00 2001
From: kojix2 <2xijok@gmail.com>
Date: Sun, 11 Oct 2020 07:55:20 +0900
Subject: [PATCH] Add a comment to params

---
 lib/uplot/command/params.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/uplot/command/params.rb b/lib/uplot/command/params.rb
index 618a33d..2633d8d 100644
--- a/lib/uplot/command/params.rb
+++ b/lib/uplot/command/params.rb
@@ -2,6 +2,11 @@
 
 module Uplot
   class Command
+    # UnicodePlot parameters.
+    # * Normally in a Ruby program, you might use hash for the parameter object.
+    # * Here, I use Struct for 2 safety reason.
+    # * The keys are static in Struct. 
+    # * Struct does not conflict with keyword arguments. Hash dose.
     Params = Struct.new(
       # Sort me!
       :title,