diff --git a/lib/rex.rb b/lib/rex.rb
index 2c84c02..777e527 100644
--- a/lib/rex.rb
+++ b/lib/rex.rb
@@ -4,7 +4,7 @@ require_relative "rex/version"
 require_relative "rex/book/limit"
 require_relative "rex/book/order"
 require_relative "rex/book/trade"
-require_relative "rex/book/order_book"
+require_relative "rex/book/limit_order_book"
 require_relative "rex/book/matcher"
 
 module Rex
diff --git a/lib/rex/book/order_book.rb b/lib/rex/book/limit_order_book.rb
similarity index 98%
rename from lib/rex/book/order_book.rb
rename to lib/rex/book/limit_order_book.rb
index 6760c01..8e953ba 100644
--- a/lib/rex/book/order_book.rb
+++ b/lib/rex/book/limit_order_book.rb
@@ -2,7 +2,7 @@ require "rbtree"
 
 module Rex
   module Book
-    class OrderBook
+    class LimitOrderBook
       def initialize(matcher: Matcher.new)
         @matcher = matcher
         @sell_side = RBTree.new
diff --git a/spec/book/order_book_spec.rb b/spec/book/limit_order_book_spec.rb
similarity index 99%
rename from spec/book/order_book_spec.rb
rename to spec/book/limit_order_book_spec.rb
index b008bd7..8f017bb 100644
--- a/spec/book/order_book_spec.rb
+++ b/spec/book/limit_order_book_spec.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-RSpec.describe Rex::Book::OrderBook do
+RSpec.describe Rex::Book::LimitOrderBook do
   let(:instance) { described_class.new }
 
   describe "#add_order" do
diff --git a/spec/book/matcher_spec.rb b/spec/book/matcher_spec.rb
index ade6797..f384ed3 100644
--- a/spec/book/matcher_spec.rb
+++ b/spec/book/matcher_spec.rb
@@ -4,7 +4,7 @@ RSpec.describe Rex::Book::Matcher do
   let(:instance) { described_class.new }
 
   describe "#match" do
-    let(:order_book) { Rex::Book::OrderBook.new }
+    let(:order_book) { Rex::Book::LimitOrderBook.new }
     let(:buy_order) { build(:order, price: 100, is_buy: true, quantity: 100, remaining_quantity: 100) }
     let(:cheaper_sell_order) { build(:order, price: 99, is_buy: false, quantity: 50, remaining_quantity: 50) }
     let(:pricier_sell_order) { build(:order, price: 100, is_buy: false, quantity: 70, remaining_quantity: 70) }
@@ -45,7 +45,7 @@ RSpec.describe Rex::Book::Matcher do
 
     context "when order book is empty" do
       it "returns an empty list" do
-        expect(instance.match(Rex::Book::OrderBook.new)).to eq([])
+        expect(instance.match(Rex::Book::LimitOrderBook.new)).to eq([])
       end
     end