diff --git a/README.md b/README.md
index efc50d4..f4043ab 100644
--- a/README.md
+++ b/README.md
@@ -398,8 +398,15 @@ Product.search "milk", load: false
 
 3. Deploy and reindex
 
+  You can reindex a particular class:
+
+  ```ruby
+  rake searchkick:reindex:class[Product] # or Product.reindex in the console
+  ```
+
+  Or you can reindex all models at the same time:
   ```ruby
-  rake searchkick:reindex CLASS=Product # or Product.reindex in the console
+  rake searchkick:reindex:all
   ```
 
 4. Once it finishes, replace search calls w/ searchkick calls
diff --git a/lib/searchkick/tasks.rb b/lib/searchkick/tasks.rb
index 084c45b..82f1201 100644
--- a/lib/searchkick/tasks.rb
+++ b/lib/searchkick/tasks.rb
@@ -2,8 +2,23 @@ require "rake"
 
 namespace :searchkick do
   desc "re-index elasticsearch"
-  task :reindex => :environment do
-    klass = ENV["CLASS"].constantize
-    klass.reindex
+  namespace :reindex do
+    desc "reindex a Model by passing it as an argument"
+    task :class, [:klass] => [:environment] do |t, args|
+      begin
+        args[:klass].constantize.reindex
+      rescue
+        puts "#{args[:klass]} model not found"
+      end
+    end
+
+    desc "reindex all models"
+    task :all => [:environment] do
+      Dir[Rails.root + "app/models/**/*.rb"].each { |path| require path }
+      models = ActiveRecord::Base.descendants.map(&:name)
+      models.each do |model|
+        model.constantize.reindex if model.respond_to?(:search)
+      end
+    end
   end
 end
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libgit2 0.21.0