diff --git a/Gemfile b/Gemfile
index c33ed34..fb9733d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,11 @@
 # frozen_string_literal: true
 source "https://rubygems.org"
 
-gem "rubocop"
+# Documentation
+gem "rdoc"
+gem "redcarpet"
 gem "yard"
 gem "yard-ghpages"
+
+# Testing
+gem "rubocop"
diff --git a/Gemfile.lock b/Gemfile.lock
index f5ca927..8830853 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,6 +9,8 @@ GEM
     rainbow (2.2.2)
       rake
     rake (11.3.0)
+    rdoc (5.1.0)
+    redcarpet (3.4.0)
     rubocop (0.48.1)
       parser (>= 2.3.3.1, < 3.0)
       powerpack (~> 0.1)
@@ -27,6 +29,8 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  rdoc
+  redcarpet
   rubocop
   yard
   yard-ghpages