diff --git a/config/default.yml b/config/default.yml
index 67176b2d5df5..da0926a636e5 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -3129,7 +3129,7 @@ Style/ExpandPathArguments:
   VersionAdded: '0.53'
 
 Style/FlipFlop:
-  Description: 'Checks for flip flops'
+  Description: 'Checks for flip-flops'
   StyleGuide: '#no-flip-flops'
   Enabled: true
   VersionAdded: '0.16'
diff --git a/lib/rubocop/cop/style/flip_flop.rb b/lib/rubocop/cop/style/flip_flop.rb
index d68dc71457b6..085ebf7070a8 100644
--- a/lib/rubocop/cop/style/flip_flop.rb
+++ b/lib/rubocop/cop/style/flip_flop.rb
@@ -3,7 +3,8 @@
 module RuboCop
   module Cop
     module Style
-      # This cop looks for uses of flip flop operator
+      # This cop looks for uses of flip-flop operator.
+      # flip-flop operator is deprecated since Ruby 2.6.0.
       #
       # @example
       #   # bad
@@ -16,7 +17,7 @@ module Style
       #     puts x if (x >= 5) && (x <= 10)
       #   end
       class FlipFlop < Cop
-        MSG = 'Avoid the use of flip flop operators.'.freeze
+        MSG = 'Avoid the use of flip-flop operators.'.freeze
 
         def on_iflipflop(node)
           add_offense(node)
diff --git a/manual/cops_style.md b/manual/cops_style.md
index feb2ac1a63fd..0374eba459d5 100644
--- a/manual/cops_style.md
+++ b/manual/cops_style.md
@@ -1895,7 +1895,8 @@ Enabled by default | Safe | Supports autocorrection | VersionAdded | VersionChan
 --- | --- | --- | --- | ---
 Enabled | Yes | No | 0.16 | -
 
-This cop looks for uses of flip flop operator
+This cop looks for uses of flip-flop operator.
+flip-flop operator is deprecated since Ruby 2.6.0.
 
 ### Examples
 
diff --git a/spec/rubocop/cop/style/flip_flop_spec.rb b/spec/rubocop/cop/style/flip_flop_spec.rb
index 5c92864d2f19..cd7eab30d0a1 100644
--- a/spec/rubocop/cop/style/flip_flop_spec.rb
+++ b/spec/rubocop/cop/style/flip_flop_spec.rb
@@ -3,20 +3,20 @@
 RSpec.describe RuboCop::Cop::Style::FlipFlop do
   subject(:cop) { described_class.new }
 
-  it 'registers an offense for inclusive flip flops' do
+  it 'registers an offense for inclusive flip-flops' do
     expect_offense(<<-RUBY.strip_indent)
       DATA.each_line do |line|
       print line if (line =~ /begin/)..(line =~ /end/)
-                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Avoid the use of flip flop operators.
+                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Avoid the use of flip-flop operators.
       end
     RUBY
   end
 
-  it 'registers an offense for exclusive flip flops' do
+  it 'registers an offense for exclusive flip-flops' do
     expect_offense(<<-RUBY.strip_indent)
       DATA.each_line do |line|
       print line if (line =~ /begin/)...(line =~ /end/)
-                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Avoid the use of flip flop operators.
+                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Avoid the use of flip-flop operators.
       end
     RUBY
   end