diff --git a/CHANGELOG.md b/CHANGELOG.md
index a5de8c081..b3ea4888d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@
 ### New features
 
 * [#50](https://github.com/rubocop-hq/rubocop-ast/pull/50): Support find pattern matching for Ruby 2.8 (3.0) parser. ([@koic][])
+* [#55](https://github.com/rubocop-hq/rubocop-ast/pull/55): Add `ProcessedSource#line_with_comment?`. ([@marcandre][])
+
+### Bug fixes
+
+* [#55](https://github.com/rubocop-hq/rubocop-ast/pull/55): Fix `ProcessedSource#commented?` for multi-line ranges. Renamed `contains_comment?` ([@marcandre][])
 
 ## 0.1.0 (2020-06-26)
 
diff --git a/lib/rubocop/ast/processed_source.rb b/lib/rubocop/ast/processed_source.rb
index 212ccd1c5..21cc7dccf 100644
--- a/lib/rubocop/ast/processed_source.rb
+++ b/lib/rubocop/ast/processed_source.rb
@@ -95,10 +95,20 @@ def blank?
         ast.nil?
       end
 
-      def commented?(source_range)
-        comment_lines.include?(source_range.line)
+      # @return [Boolean] if the given line number has a comment.
+      def line_with_comment?(line)
+        comment_lines.include?(line)
       end
 
+      # @return [Boolean] if any of the lines in the given `source_range` has a comment.
+      def contains_comment?(source_range)
+        (source_range.line..source_range.last_line).any? do |line|
+          line_with_comment?(line)
+        end
+      end
+      # @deprecated use contains_comment?
+      alias commented? contains_comment?
+
       def comments_before_line(line)
         comments.select { |c| c.location.line <= line }
       end
diff --git a/spec/rubocop/ast/processed_source_spec.rb b/spec/rubocop/ast/processed_source_spec.rb
index 4fba7e818..dbc7a4cae 100644
--- a/spec/rubocop/ast/processed_source_spec.rb
+++ b/spec/rubocop/ast/processed_source_spec.rb
@@ -251,25 +251,64 @@ def foo # comment one
       end
     end
 
-    describe '#commented?' do
-      subject(:commented) { processed_source.commented?(range) }
+    describe '#line_with_comment?' do
+      let(:source) { <<~RUBY }
+        # comment
+        [
+          1, # comment
+          2
+        ]
+      RUBY
+
+      it 'returns true for lines with comments' do
+        expect(processed_source.line_with_comment?(1)).to be true
+        expect(processed_source.line_with_comment?(3)).to be true
+      end
+
+      it 'returns false for lines without comments' do
+        expect(processed_source.line_with_comment?(2)).to be false
+        expect(processed_source.line_with_comment?(4)).to be false
+      end
+    end
+
+    describe '#contains_comment?' do
+      subject(:commented) { processed_source.contains_comment?(range) }
 
       let(:source) { <<~RUBY }
         # comment
-        [ 1, 2 ]
+        [ 1,
+          { a: 2,
+            b: 3 # comment
+          }
+        ]
       RUBY
+      let(:ast) { processed_source.ast }
+      let(:array) { ast }
+      let(:hash) { array.children[1] }
 
       context 'provided source_range on line without comment' do
-        let(:range) { processed_source.find_token(&:left_bracket?).pos }
+        let(:range) { hash.pairs.first.loc.expression }
 
         it { is_expected.to be false }
       end
 
-      context 'provided source_range on line with comment' do
+      context 'provided source_range on comment line' do
         let(:range) { processed_source.find_token(&:comment?).pos }
 
         it { is_expected.to be true }
       end
+
+      context 'provided source_range on line with comment' do
+        let(:range) { hash.pairs.last.loc.expression }
+
+        it { is_expected.to be true }
+      end
+
+      context 'provided a multiline source_range with at least one line with comment' do
+        let(:range) { array.loc.expression }
+
+        it { is_expected.to be true }
+      end
     end
 
     describe '#comments_before_line' do