diff --git a/config/default.yml b/config/default.yml
index 7d4eb60fd58..856d3b6dbe9 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -182,6 +182,11 @@ Bundler/GemFilename:
   SupportedStyles:
     - 'Gemfile'
     - 'gems.rb'
+  Include:
+    - '**/Gemfile'
+    - '**/gems.rb'
+    - '**/Gemfile.lock'
+    - '**/gems.locked'
 
 Bundler/GemVersion:
   Description: 'Requires or forbids specifying gem versions.'
diff --git a/lib/rubocop/cop/bundler/gem_filename.rb b/lib/rubocop/cop/bundler/gem_filename.rb
index 15ca89eca76..2c0536ded0e 100644
--- a/lib/rubocop/cop/bundler/gem_filename.rb
+++ b/lib/rubocop/cop/bundler/gem_filename.rb
@@ -29,62 +29,65 @@ class GemFilename < Base
         include ConfigurableEnforcedStyle
         include RangeHelp
 
-        MSG_GEMFILE_REQUIRED = '`gems.rb` file was found but `Gemfile` is required.'
-        MSG_GEMS_RB_REQUIRED = '`Gemfile` was found but `gems.rb` file is required.'
+        MSG_GEMFILE_REQUIRED = '`gems.rb` file was found but `Gemfile` is required '\
+                               '(file path: %<file_path>s).'
+        MSG_GEMS_RB_REQUIRED = '`Gemfile` was found but `gems.rb` file is required '\
+                               '(file path: %<file_path>s).'
         MSG_GEMFILE_MISMATCHED = 'Expected a `Gemfile.lock` with `Gemfile` but found '\
-                                 '`gems.locked` file.'
+                                 '`gems.locked` file (file path: %<file_path>s).'
         MSG_GEMS_RB_MISMATCHED = 'Expected a `gems.locked` file with `gems.rb` but found '\
-                                 '`Gemfile.lock`.'
+                                 '`Gemfile.lock` (file path: %<file_path>s).'
         GEMFILE_FILES = %w[Gemfile Gemfile.lock].freeze
         GEMS_RB_FILES = %w[gems.rb gems.locked].freeze
 
         def on_new_investigation
           file_path = processed_source.file_path
-          return if expected_gemfile?(file_path)
+          basename = File.basename(file_path)
+          return if expected_gemfile?(basename)
 
-          register_offense(processed_source.buffer, file_path)
+          register_offense(file_path, basename)
         end
 
         private
 
-        def register_offense(source_buffer, file_path)
-          register_gemfile_offense(source_buffer, file_path) if gemfile_offense?(file_path)
-          register_gems_rb_offense(source_buffer, file_path) if gems_rb_offense?(file_path)
+        def register_offense(file_path, basename)
+          register_gemfile_offense(file_path, basename) if gemfile_offense?(basename)
+          register_gems_rb_offense(file_path, basename) if gems_rb_offense?(basename)
         end
 
-        def register_gemfile_offense(source_buffer, file_path)
-          message = case file_path
+        def register_gemfile_offense(file_path, basename)
+          message = case basename
                     when 'gems.rb'
                       MSG_GEMFILE_REQUIRED
                     when 'gems.locked'
                       MSG_GEMFILE_MISMATCHED
                     end
 
-          add_offense(source_range(source_buffer, 1, 0), message: message)
+          add_global_offense(format(message, file_path: file_path))
         end
 
-        def register_gems_rb_offense(source_buffer, file_path)
-          message = case file_path
+        def register_gems_rb_offense(file_path, basename)
+          message = case basename
                     when 'Gemfile'
                       MSG_GEMS_RB_REQUIRED
                     when 'Gemfile.lock'
                       MSG_GEMS_RB_MISMATCHED
                     end
 
-          add_offense(source_range(source_buffer, 1, 0), message: message)
+          add_global_offense(format(message, file_path: file_path))
         end
 
-        def gemfile_offense?(file_path)
-          gemfile_required? && %w[gems.rb gems.locked].include?(file_path)
+        def gemfile_offense?(basename)
+          gemfile_required? && GEMS_RB_FILES.include?(basename)
         end
 
-        def gems_rb_offense?(file_path)
-          gems_rb_required? && %w[Gemfile Gemfile.lock].include?(file_path)
+        def gems_rb_offense?(basename)
+          gems_rb_required? && GEMFILE_FILES.include?(basename)
         end
 
-        def expected_gemfile?(file_path)
-          (gemfile_required? && GEMFILE_FILES.include?(file_path)) ||
-            (gems_rb_required? && GEMS_RB_FILES.include?(file_path))
+        def expected_gemfile?(basename)
+          (gemfile_required? && GEMFILE_FILES.include?(basename)) ||
+            (gems_rb_required? && GEMS_RB_FILES.include?(basename))
         end
 
         def gemfile_required?
diff --git a/spec/rubocop/cop/bundler/gem_filename_spec.rb b/spec/rubocop/cop/bundler/gem_filename_spec.rb
index 3362fcfa205..f212cb95001 100644
--- a/spec/rubocop/cop/bundler/gem_filename_spec.rb
+++ b/spec/rubocop/cop/bundler/gem_filename_spec.rb
@@ -27,14 +27,33 @@
     context 'with gems.rb file path' do
       let(:filename) { 'gems.rb' }
 
-      include_examples 'invalid gem file', '`gems.rb` file was found but `Gemfile` is required.'
+      include_examples 'invalid gem file',
+                       '`gems.rb` file was found but `Gemfile` is required '\
+                       '(file path: gems.rb).'
+    end
+
+    context 'with non-root gems.rb file path' do
+      let(:filename) { 'spec/gems.rb' }
+
+      include_examples 'invalid gem file',
+                       '`gems.rb` file was found but `Gemfile` is required '\
+                       '(file path: spec/gems.rb).'
     end
 
     context 'with gems.locked file path' do
       let(:filename) { 'gems.locked' }
 
       include_examples 'invalid gem file',
-                       'Expected a `Gemfile.lock` with `Gemfile` but found `gems.locked` file.'
+                       'Expected a `Gemfile.lock` with `Gemfile` but found `gems.locked` file '\
+                       '(file path: gems.locked).'
+    end
+
+    context 'with non-root gems.locked file path' do
+      let(:filename) { 'spec/gems.locked' }
+
+      include_examples 'invalid gem file',
+                       'Expected a `Gemfile.lock` with `Gemfile` but found `gems.locked` file '\
+                       '(file path: spec/gems.locked).'
     end
 
     context 'with Gemfile file path' do
@@ -43,11 +62,23 @@
       include_examples 'valid gem file'
     end
 
+    context 'with non-root Gemfile file path' do
+      let(:filename) { 'spec/Gemfile' }
+
+      include_examples 'valid gem file'
+    end
+
     context 'with Gemfile.lock file path' do
       let(:filename) { 'Gemfile.lock' }
 
       include_examples 'valid gem file'
     end
+
+    context 'with non-root Gemfile.lock file path' do
+      let(:filename) { 'spec/Gemfile.lock' }
+
+      include_examples 'valid gem file'
+    end
   end
 
   context 'with EnforcedStyle set to `gems.rb`' do
@@ -60,14 +91,31 @@
     context 'with Gemfile file path' do
       let(:filename) { 'Gemfile' }
 
-      include_examples 'invalid gem file', '`Gemfile` was found but `gems.rb` file is required.'
+      include_examples 'invalid gem file', '`Gemfile` was found but `gems.rb` file is required '\
+                                           '(file path: Gemfile).'
+    end
+
+    context 'with non-root Gemfile file path' do
+      let(:filename) { 'spec/Gemfile' }
+
+      include_examples 'invalid gem file', '`Gemfile` was found but `gems.rb` file is required '\
+                                           '(file path: spec/Gemfile).'
     end
 
     context 'with Gemfile.lock file path' do
       let(:filename) { 'Gemfile.lock' }
 
       include_examples 'invalid gem file',
-                       'Expected a `gems.locked` file with `gems.rb` but found `Gemfile.lock`.'
+                       'Expected a `gems.locked` file with `gems.rb` but found `Gemfile.lock` '\
+                       '(file path: Gemfile.lock).'
+    end
+
+    context 'with non-root Gemfile.lock file path' do
+      let(:filename) { 'spec/Gemfile.lock' }
+
+      include_examples 'invalid gem file',
+                       'Expected a `gems.locked` file with `gems.rb` but found `Gemfile.lock` '\
+                       '(file path: spec/Gemfile.lock).'
     end
 
     context 'with gems.rb file path' do
@@ -76,8 +124,14 @@
       include_examples 'valid gem file'
     end
 
-    context 'with gems.locked file path' do
-      let(:filename) { 'gems.locked' }
+    context 'with non-root gems.rb file path' do
+      let(:filename) { 'spec/gems.rb' }
+
+      include_examples 'valid gem file'
+    end
+
+    context 'with non-root gems.locked file path' do
+      let(:filename) { 'spec/gems.locked' }
 
       include_examples 'valid gem file'
     end