diff --git a/lib/probot.rb b/lib/probot.rb
index fecf236..e1002e3 100644
--- a/lib/probot.rb
+++ b/lib/probot.rb
@@ -19,8 +19,8 @@ require "net/http"
 #   Find the most specific rule for a given URL. We use the length of the regexp as a proxy for specificity.
 
 class Probot
-  attr_reader :rules, :sitemap, :doc
-  attr_accessor :agent
+  attr_reader :rules, :doc
+  attr_accessor :agent, :sitemaps, :site
 
   def initialize(data, agent: "*")
     raise ArgumentError, "The first argument must be a string" unless data.is_a?(String)
@@ -30,8 +30,8 @@ class Probot
     @current_agents = ["*"]
     @current_agents.each { |agent| @rules[agent] ||= {"disallow" => [], "allow" => [], "crawl_delay" => 0} }
     @sitemaps = []
-
-    @doc = data.start_with?("http") ? fetch_robots_txt(data) : data
+    @site = URI(data) if data.start_with?("http")
+    @doc = @site.nil? ? data : fetch_robots_txt(@site)
     parse(@doc)
   end
 
@@ -90,11 +90,11 @@ class Probot
       end
 
       # All Regex characters are escaped, then we unescape * and $ as they may used in robots.txt
-
       if data.allow? || data.disallow?
         @current_agents.each { |agent| rules[agent][data.key] << Regexp.new(Regexp.escape(data.value).gsub('\*', ".*").gsub('\$', "$")) }
 
-        subsequent_agent = false # When user-agent strings are found on consecutive lines, they are considered to be part of the same record. Google ignores crawl_delay.
+        # When user-agent strings are found on consecutive lines, they are considered to be part of the same record. Google ignores crawl_delay.
+        subsequent_agent = false
         next
       end
 
@@ -103,8 +103,11 @@ class Probot
         next
       end
 
+      # Ensure we have an absolute URL
       if data.sitemap?
-        @sitemap = URI(data.value).path
+        sitemap_uri = URI(data.value)
+        sitemap_uri = sitemap_uri.host.nil? ? URI.join(*[site, sitemap_uri].compact) : sitemap_uri
+        @sitemaps << sitemap_uri.to_s
         next
       end
 
diff --git a/probot.gemspec b/probot.gemspec
index a716caf..b148774 100644
--- a/probot.gemspec
+++ b/probot.gemspec
@@ -29,10 +29,4 @@ Gem::Specification.new do |spec|
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
-
-  # Uncomment to register a new dependency of your gem
-  # spec.add_dependency "example-gem", "~> 1.0"
-
-  # For more information and examples about making a new gem, check out our
-  # guide at: https://bundler.io/guides/creating_gem.html
 end
diff --git a/test/test_probot.rb b/test/test_probot.rb
index 4930fcc..7333342 100644
--- a/test/test_probot.rb
+++ b/test/test_probot.rb
@@ -25,7 +25,7 @@ class TestProbot < Minitest::Test
       Disallow: /noblah/
       Allow: /cart/
       ),
-      sitemap: "/sitemap.xml",
+      sitemaps: ["http://www.allenandunwin.com/sitemap.xml"],
       found_agents: ["*", "FooBot", "BlahBot", "YadaBot"],
       tests: [
         {
@@ -51,7 +51,7 @@ class TestProbot < Minitest::Test
       Allow: /    # comment
       Sitemap: http://example.com/sitemap.xml
       ),
-      sitemap: "/sitemap.xml",
+      sitemaps: ["http://example.com/sitemap.xml"],
       found_agents: ["*"],
       tests: [
         {
@@ -85,7 +85,7 @@ class TestProbot < Minitest::Test
       sitemap: /sitemapxml.xml
 
       ),
-      sitemap: "/sitemapxml.xml",
+      sitemaps: ["/sitemapxml.xml"],
       found_agents: ["*", "rubytest"],
       tests: [
         {
@@ -103,7 +103,7 @@ class TestProbot < Minitest::Test
       r = Probot.new(test_case[:txt])
 
       assert_equal test_case[:found_agents], r.found_agents, "found_agents for test #{ind}"
-      assert_equal test_case[:sitemap], r.sitemap, "sitemap for test #{ind}"
+      assert_equal test_case[:sitemaps], r.sitemaps, "sitemap for test #{ind}"
 
       test_case[:tests].each do |tst|
         r = Probot.new(test_case[:txt], agent: tst[:agent])
@@ -167,4 +167,26 @@ class TestProbot < Minitest::Test
     assert r.allowed?("/dir/page") == true
     assert r.allowed?("/dir/page?var") == false
   end
+
+  def test_multiple_sitemaps
+    txt = %(User-agent: *\nSitemap: https://example.com/sitemapxml.xml\nSitemap: https://example.com/sitemapxml2.xml\n\n)
+    r = Probot.new(txt)
+    assert_equal 2, r.sitemaps.length
+    assert r.sitemaps.include?("https://example.com/sitemapxml.xml")
+    assert r.sitemaps.include?("https://example.com/sitemapxml2.xml")
+  end
+
+  def test_absolute_sitemaps
+    txt = %(User-agent: *\nSitemap: /sitemapxml.xml\nSitemap: /sitemapxml2.xml\n\n)
+
+    r = Probot.new(txt)
+    # We have to manually set the site, as we're not parsing a URL - then we need to reset the sitemaps array and reparse the doc.
+    r.site = URI("https://example.com")
+    r.sitemaps = []
+    r.parse(r.doc)
+
+    assert_equal 2, r.sitemaps.length
+    assert r.sitemaps.include?("https://example.com/sitemapxml.xml"), "expected https://example.com/sitemapxml.xml, got #{r.sitemaps}"
+    assert r.sitemaps.include?("https://example.com/sitemapxml2.xml"), "expected https://example.com/sitemapxml2.xml, got #{r.sitemaps}"
+  end
 end