diff --git a/changelog/change_1295_covers_validates_comparison_of_in.md b/changelog/change_1295_covers_validates_comparison_of_in.md
new file mode 100644
index 0000000000..bdcadc8ec6
--- /dev/null
+++ b/changelog/change_1295_covers_validates_comparison_of_in.md
@@ -0,0 +1 @@
+* [#1295](https://github.com/rubocop/rubocop-rails/issues/1295): Cover validates_comparison_of in `Rails/Validation`. ([@ChaelCodes][])
diff --git a/lib/rubocop/cop/rails/validation.rb b/lib/rubocop/cop/rails/validation.rb
index 5499f3991d..beaa8f2b6e 100644
--- a/lib/rubocop/cop/rails/validation.rb
+++ b/lib/rubocop/cop/rails/validation.rb
@@ -8,6 +8,7 @@ module Rails
       # @example
       #   # bad
       #   validates_acceptance_of :foo
+      #   validates_comparison_of :foo
       #   validates_confirmation_of :foo
       #   validates_exclusion_of :foo
       #   validates_format_of :foo
@@ -22,6 +23,7 @@ module Rails
       #   # good
       #   validates :foo, acceptance: true
       #   validates :foo, confirmation: true
+      #   validates :foo, comparison: true
       #   validates :foo, exclusion: true
       #   validates :foo, format: true
       #   validates :foo, inclusion: true
@@ -39,6 +41,7 @@ class Validation < Base
 
         TYPES = %w[
           acceptance
+          comparison
           confirmation
           exclusion
           format
diff --git a/spec/rubocop/cop/rails/validation_spec.rb b/spec/rubocop/cop/rails/validation_spec.rb
index e789842d6d..20f2fabea3 100644
--- a/spec/rubocop/cop/rails/validation_spec.rb
+++ b/spec/rubocop/cop/rails/validation_spec.rb
@@ -159,6 +159,18 @@
       include_examples 'autocorrects'
     end
 
+    context 'with a proc' do
+      let(:autocorrected_source) do
+        'validates :a, :b, comparison: { greater_than: -> { Time.zone.today } }'
+      end
+
+      let(:source) do
+        'validates_comparison_of :a, :b, greater_than: -> { Time.zone.today }'
+      end
+
+      include_examples 'autocorrects'
+    end
+
     context 'with splat' do
       let(:autocorrected_source) do
         'validates :a, *b, numericality: true'