diff --git a/lib/annotate/annotate_models/file_patterns.rb b/lib/annotate/annotate_models/file_patterns.rb
index 262d3e0a2..f6cf3c0e7 100644
--- a/lib/annotate/annotate_models/file_patterns.rb
+++ b/lib/annotate/annotate_models/file_patterns.rb
@@ -59,7 +59,10 @@ def generate(root_directory, pattern_type, options)
         when 'controller'
           [File.join(root_directory, CONTROLLER_DIR, '%PLURALIZED_MODEL_NAME%_controller.rb')]
         when 'admin'
-          [File.join(root_directory, ACTIVEADMIN_DIR, '%MODEL_NAME%.rb')]
+          [
+            File.join(root_directory, ACTIVEADMIN_DIR, '%MODEL_NAME%.rb'),
+            File.join(root_directory, ACTIVEADMIN_DIR, '%PLURALIZED_MODEL_NAME%.rb')
+          ]
         when 'helper'
           [File.join(root_directory, HELPER_DIR, '%PLURALIZED_MODEL_NAME%_helper.rb')]
         else
diff --git a/spec/lib/annotate/annotate_models/file_patterns_spec.rb b/spec/lib/annotate/annotate_models/file_patterns_spec.rb
index 9c3138625..eabc1c5da 100644
--- a/spec/lib/annotate/annotate_models/file_patterns_spec.rb
+++ b/spec/lib/annotate/annotate_models/file_patterns_spec.rb
@@ -119,10 +119,8 @@
     context 'when pattern_type is "admin"' do
       let(:pattern_type) { 'admin' }
 
-      it 'returns patterns of admin files' do
-        is_expected.to eq([
-          '/root/app/admin/%MODEL_NAME%.rb'
-        ])
+      it 'returns both singular and pluralized model names' do
+        is_expected.to eq(['/root/app/admin/%MODEL_NAME%.rb', '/root/app/admin/%PLURALIZED_MODEL_NAME%.rb'])
       end
     end