diff --git a/changelog/change_mark_minitest_refute_false_as_unsafe_autocorrection.md b/changelog/change_mark_minitest_refute_false_as_unsafe_autocorrection.md
new file mode 100644
index 00000000..82e43f9f
--- /dev/null
+++ b/changelog/change_mark_minitest_refute_false_as_unsafe_autocorrection.md
@@ -0,0 +1 @@
+* [#233](https://github.com/rubocop/rubocop-minitest/issues/233): Mark `Minitest/RefuteFalse` as unsafe autocorrection. ([@koic][])
diff --git a/config/default.yml b/config/default.yml
index f49a550f..9b2c65f8 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -191,7 +191,9 @@ Minitest/RefuteFalse:
   Description: 'Check if your test uses `refute(actual)` instead of `assert_equal(false, actual)`.'
   StyleGuide: 'https://minitest.rubystyle.guide#refute-false'
   Enabled: true
+  SafeAutoCorrect: false
   VersionAdded: '0.3'
+  VersionChanged: '<<next>>'
 
 Minitest/RefuteInDelta:
   Description: 'This cop enforces the test to use `refute_in_delta` instead of using `refute_equal` to compare floats.'
diff --git a/lib/rubocop/cop/minitest/refute_false.rb b/lib/rubocop/cop/minitest/refute_false.rb
index 60bb19ae..dacdfed4 100644
--- a/lib/rubocop/cop/minitest/refute_false.rb
+++ b/lib/rubocop/cop/minitest/refute_false.rb
@@ -5,6 +5,15 @@ module Cop
     module Minitest
       # Enforces the use of `refute(object)` over `assert_equal(false, object)`.
       #
+      # @safety
+      #   This cop's autocorrection is unsafe because it cannot detect failure when second argument is `nil`.
+      #
+      #   [source,ruby]
+      #   ----
+      #   assert_equal(false, nil) # failure
+      #   refute(nil)              # success
+      #   ----
+      #
       # @example
       #   # bad
       #   assert_equal(false, actual)