diff --git a/microsoft_kb/microsoft_kb_checker.rb b/microsoft_kb/microsoft_kb_checker.rb
index e67f64e..8b9223e 100644
--- a/microsoft_kb/microsoft_kb_checker.rb
+++ b/microsoft_kb/microsoft_kb_checker.rb
@@ -12,6 +12,8 @@ class MicrosoftKbChecker
   attr_accessor :options
 
   # options hash {:cve_id => 'cve-2020-1234', :os_name => 'Windows Server 2012'}
+  # you can also pass in an advisory number as it uses the same API endpoint
+  # eg... {:cve_id => 'ADV180002', :os_name => "Windows Server 2012 R2"}
   def initialize(options)
     @options = options
   end
@@ -115,7 +117,7 @@ class MicrosoftKbChecker
     kbs = articles.map do |article_info|
       num = article_info[:article_num]
       os_json.values_at("articleTitle#{num}")
-    end.flatten.reject! { |kb| kb == '' }
+    end.flatten.reject { |kb| kb == '' }
     {
       os_name: os_json['name'],
       cve_id: options[:cve_id],