diff --git a/CHANGELOG.md b/CHANGELOG.md
index 25eff13..320324a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.3.2 (unreleased)
+
+- Improved generator for Active Record encryption and MySQL
+
 ## 2.3.1 (2024-09-09)
 
 - Fixed deprecation warning with Rails 7.1
diff --git a/README.md b/README.md
index 2df4121..6543ead 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ rails generate ahoy:messages --encryption=lockbox
 rails db:migrate
 ```
 
-To use Active Record encryption (Rails 7+, experimental), run:
+To use Active Record encryption (Rails 7+), run:
 
 ```sh
 rails generate ahoy:messages --encryption=activerecord
diff --git a/lib/generators/ahoy/messages/activerecord_generator.rb b/lib/generators/ahoy/messages/activerecord_generator.rb
index dd104d5..5068724 100644
--- a/lib/generators/ahoy/messages/activerecord_generator.rb
+++ b/lib/generators/ahoy/messages/activerecord_generator.rb
@@ -34,8 +34,11 @@ def to_column
           when "lockbox"
             "t.text :to_ciphertext\n      t.string :to_bidx, index: true"
           else
-            # TODO add limit: 510 for Active Record encryption + MySQL?
-            "t.string :to, index: true"
+            if encryption == "activerecord" && mysql?
+              "t.string :to, limit: 510, index: true"
+            else
+              "t.string :to, index: true"
+            end
           end
         end
 
@@ -63,6 +66,14 @@ def lockbox_method
             "has_encrypted"
           end
         end
+
+        def mysql?
+          adapter =~ /mysql|trilogy/i
+        end
+
+        def adapter
+          ActiveRecord::Base.connection_db_config.adapter.to_s
+        end
       end
     end
   end