diff --git a/judges/quality-of-service/quality-of-service.rb b/judges/quality-of-service/quality-of-service.rb
index e8e5342b..eaccdfff 100644
--- a/judges/quality-of-service/quality-of-service.rb
+++ b/judges/quality-of-service/quality-of-service.rb
@@ -124,15 +124,18 @@
   f.average_pull_hoc_size = hocs.empty? ? 0 : hocs.sum.to_f / hocs.size
   f.average_pull_files_size = files.empty? ? 0 : files.sum.to_f / files.size
 
-  # Average review time
+  # Average review time and comments
   review_times = []
+  review_comments = []
   Fbe.unmask_repos.each do |repo|
     Fbe.octo.search_issues(
       "repo:#{repo} type:pr is:merged closed:>#{f.since.utc.iso8601[0..9]}"
     )[:items].each do |pr|
       review = Fbe.octo.pull_request_reviews(repo, pr[:number]).min_by { |r| r[:submitted_at] }
       review_times << (pr[:merged_at] - review[:submitted_at]).to_i if review
+      review_comments << Fbe.octo.review_comments(repo, pr[:number]).size
     end
   end
   f.average_review_time = review_times.empty? ? 0 : review_times.sum.to_f / review_times.size
+  f.average_review_size = review_comments.empty? ? 0 : review_comments.sum.to_f / review_comments.size
 end
diff --git a/judges/quality-of-service/simple-collect.yml b/judges/quality-of-service/simple-collect.yml
index 1bfc01ea..cfd09ca9 100644
--- a/judges/quality-of-service/simple-collect.yml
+++ b/judges/quality-of-service/simple-collect.yml
@@ -49,3 +49,4 @@ expected:
   - /fb/f[average_pull_hoc_size != 0]
   - /fb/f[average_pull_files_size != 0]
   - /fb/f[average_review_time != 0]
+  - /fb/f[average_review_size != 0]
diff --git a/test/judges/test-quality-of-service.rb b/test/judges/test-quality-of-service.rb
index 159ea2b3..aa4490bf 100644
--- a/test/judges/test-quality-of-service.rb
+++ b/test/judges/test-quality-of-service.rb
@@ -141,6 +141,7 @@ def test_runs_when_run_duration_ms_is_nil
       'https://api.github.com/repos/foo/foo/pulls/12/reviews?per_page=100',
       body: [{ id: 22_449_326, submitted_at: Time.parse('2024-07-21 22:00:00 UTC') }]
     )
+    stub_github('https://api.github.com/repos/foo/foo/pulls/12/comments?per_page=100', body: [])
     fb = Factbase.new
     Time.stub(:now, Time.parse('2024-08-12 21:00:00 UTC')) do
       load_it('quality-of-service', fb)
@@ -176,6 +177,7 @@ def test_quality_of_service_average_issues
         }
       }]
     )
+    stub_github('https://api.github.com/repos/foo/foo/pulls/12/comments?per_page=100', body: [])
     fb = Factbase.new
     f = fb.insert
     f.what = 'pmp'
@@ -265,6 +267,7 @@ def test_quality_of_service_average_build_mttr
       'https://api.github.com/repos/foo/foo/pulls/12/reviews?per_page=100',
       body: [{ id: 22_449_326, submitted_at: Time.parse('2024-08-21 22:00:00 UTC') }]
     )
+    stub_github('https://api.github.com/repos/foo/foo/pulls/12/comments?per_page=100', body: [])
     fb = Factbase.new
     f = fb.insert
     f.what = 'pmp'
@@ -366,6 +369,7 @@ def test_quality_of_service_average_build_mttr_when_failure_several_times_in_a_r
       'https://api.github.com/repos/foo/foo/pulls/12/reviews?per_page=100',
       body: [{ id: 22_449_326, submitted_at: Time.parse('2024-08-21 22:00:00 UTC') }]
     )
+    stub_github('https://api.github.com/repos/foo/foo/pulls/12/comments?per_page=100', body: [])
     fb = Factbase.new
     f = fb.insert
     f.what = 'pmp'
@@ -497,6 +501,11 @@ def test_quality_of_service_average_hocs_and_files
     stub_github('https://api.github.com/repos/foo/foo/pulls/16/reviews?per_page=100', body: [])
     stub_github('https://api.github.com/repos/foo/foo/pulls/18/reviews?per_page=100', body: [])
     stub_github('https://api.github.com/repos/foo/foo/pulls/20/reviews?per_page=100', body: [])
+    stub_github('https://api.github.com/repos/foo/foo/pulls/12/comments?per_page=100', body: [])
+    stub_github('https://api.github.com/repos/foo/foo/pulls/14/comments?per_page=100', body: [])
+    stub_github('https://api.github.com/repos/foo/foo/pulls/16/comments?per_page=100', body: [])
+    stub_github('https://api.github.com/repos/foo/foo/pulls/18/comments?per_page=100', body: [])
+    stub_github('https://api.github.com/repos/foo/foo/pulls/20/comments?per_page=100', body: [])
     fb = Factbase.new
     f = fb.insert
     f.what = 'pmp'
@@ -513,7 +522,7 @@ def test_quality_of_service_average_hocs_and_files
     end
   end
 
-  def test_quality_of_service_average_review_time
+  def test_quality_of_service_average_review_time_and_comments
     WebMock.disable_net_connect!
     stub_github('https://api.github.com/repos/foo/foo', body: { id: 42, full_name: 'foo/foo' })
     stub_github(
@@ -605,6 +614,137 @@ def test_quality_of_service_average_review_time
       ]
     )
     stub_github('https://api.github.com/repos/foo/foo/pulls/16/reviews?per_page=100', body: [])
+    stub_github(
+      'https://api.github.com/repos/foo/foo/pulls/12/comments?per_page=100',
+      body: [
+        {
+          pull_request_review_id: 22_687_249,
+          id: 17_361_949,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'yegor256', id: 526_301, type: 'User' },
+          body: 'Some comment 1',
+          created_at: Time.parse('2024-09-05 10:31:06 UTC'),
+          updated_at: Time.parse('2024-09-05 10:33:04 UTC'),
+          author_association: 'MEMBER'
+        },
+        {
+          pull_request_review_id: 22_687_503,
+          id: 17_361_950,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 2',
+          created_at: Time.parse('2024-09-05 11:40:00 UTC'),
+          updated_at: Time.parse('2024-09-05 11:41:05 UTC'),
+          author_association: 'CONTRIBUTOR'
+        },
+        {
+          pull_request_review_id: 22_687_543,
+          id: 17_361_955,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 3',
+          created_at: Time.parse('2024-09-05 15:55:07 UTC'),
+          updated_at: Time.parse('2024-09-05 15:55:07 UTC'),
+          author_association: 'CONTRIBUTOR'
+        },
+        {
+          pull_request_review_id: 22_687_563,
+          id: 17_361_960,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 4',
+          created_at: Time.parse('2024-09-05 16:40:00 UTC'),
+          updated_at: Time.parse('2024-09-05 16:41:05 UTC'),
+          author_association: 'CONTRIBUTOR'
+        },
+        {
+          pull_request_review_id: 22_687_573,
+          id: 17_361_970,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 5',
+          created_at: Time.parse('2024-09-05 17:55:07 UTC'),
+          updated_at: Time.parse('2024-09-05 17:55:07 UTC'),
+          author_association: 'CONTRIBUTOR'
+        }
+      ]
+    )
+    stub_github('https://api.github.com/repos/foo/foo/pulls/14/comments?per_page=100', body: [])
+    stub_github(
+      'https://api.github.com/repos/foo/foo/pulls/16/comments?per_page=100',
+      body: [
+        {
+          pull_request_review_id: 22_687_505,
+          id: 17_371_800,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'yegor256', id: 526_301, type: 'User' },
+          body: 'Some comment 1',
+          created_at: Time.parse('2024-09-05 10:31:06 UTC'),
+          updated_at: Time.parse('2024-09-05 10:33:04 UTC'),
+          author_association: 'MEMBER'
+        },
+        {
+          pull_request_review_id: 22_687_607,
+          id: 17_371_810,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 2',
+          created_at: Time.parse('2024-09-05 11:40:00 UTC'),
+          updated_at: Time.parse('2024-09-05 11:41:05 UTC'),
+          author_association: 'CONTRIBUTOR'
+        },
+        {
+          pull_request_review_id: 22_687_617,
+          id: 17_371_820,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 3',
+          created_at: Time.parse('2024-09-05 12:40:00 UTC'),
+          updated_at: Time.parse('2024-09-05 12:41:05 UTC'),
+          author_association: 'CONTRIBUTOR'
+        },
+        {
+          pull_request_review_id: 22_687_627,
+          id: 17_371_820,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 4',
+          created_at: Time.parse('2024-09-05 13:40:00 UTC'),
+          updated_at: Time.parse('2024-09-05 13:41:05 UTC'),
+          author_association: 'CONTRIBUTOR'
+        },
+        {
+          pull_request_review_id: 22_687_637,
+          id: 17_371_830,
+          diff_hunk: "@@ -427,4 +481,107 @@ def example\n",
+          path: 'test/example.rb',
+          commit_id: '11e3a0dd2d1',
+          user: { login: 'Yegorov', id: 123_234_123, type: 'User' },
+          body: 'Some comment 5',
+          created_at: Time.parse('2024-09-05 14:40:00 UTC'),
+          updated_at: Time.parse('2024-09-05 14:41:05 UTC'),
+          author_association: 'CONTRIBUTOR'
+        }
+      ]
+    )
     fb = Factbase.new
     f = fb.insert
     f.what = 'pmp'
@@ -617,6 +757,7 @@ def test_quality_of_service_average_review_time
       assert_equal(Time.parse('2024-08-02 21:00:00 UTC'), f.since)
       assert_equal(Time.parse('2024-08-09 21:00:00 UTC'), f.when)
       assert_in_delta(431_100, f.average_review_time)
+      assert_in_delta(3.333, f.average_review_size)
     end
   end