diff --git a/README.md b/README.md
index 604e72f4..c79d1a1f 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,9 @@
 
 The AI plugin provides a set of opt-in AI features for authors, editors, and admins directly within WordPress. It serves as a reference implementation for developers, agencies, and hosts looking to build or extend AI-powered workflows using building blocks from the WordPress AI team (as [*part of the **AI Building Blocks for WordPress** initiative*](https://make.wordpress.org/ai/2025/07/17/ai-building-blocks)).
 
+> [!NOTE]
+> This plugin is experimental.  Features may change, move, or break.  Use on Production sites at your own risk.  It is recommended to test in a non-Production environment and follow the plugin’s development closely if adopting early.
+
 ## Overview
 
 * **Purpose:** Demonstrate and deliver AI features by combining the AI Building Blocks ([PHP AI Client SDK](https://github.com/WordPress/php-ai-client), [Abilities API](https://github.com/WordPress/abilities-api)) into a unified WordPress experience.
@@ -22,7 +25,16 @@ The AI plugin provides a set of opt-in AI features for authors, editors, and adm
 
 This [Canonical Plugin](https://make.wordpress.org/core/2022/09/11/canonical-plugins-revisited/) is built following the [Features as Plugins model](https://make.wordpress.org/core/handbook/about/release-cycle/features-as-plugins/). The community will help evaluate which features could evolve toward inclusion in WordPress core based on testing, feedback, and adoption.
 
-*Note: This plugin is experimental.  Features may change, move, or break.  Use on Production sites at your own risk.  It is recommended to test in a non-Production environment and follow the plugin’s development closely if adopting early.*
+### Editor Support
+
+> [!IMPORTANT]  
+> The AI plugin is built exclusively for the Block Editor (aka Gutenberg).
+
+The AI plugin does not currently support the Classic Editor plugin or other non-Block Editor editing experiences.
+
+This is an intentional project decision.  The Block Editor has been the default WordPress editing experience since WordPress 5.0, released in December 2018, and continues to be the primary editor actively developed by the WordPress project.  Focusing on a single editing experience allows contributors to move faster, explore new AI-powered workflows, and build deeper integrations without the overhead of maintaining multiple editor implementations.
+
+While the Classic Editor plugin remains widely used, the AI plugin is focused on the future direction of WordPress editing and content creation.  Contributors interested in bringing AI functionality to the Classic Editor are welcome to explore and maintain those integrations, but support for Classic Editor is not currently planned by the plugin's maintainers.
 
 ## Design Goals
 
diff --git a/readme.txt b/readme.txt
index 3df160ae..837f3b75 100644
--- a/readme.txt
+++ b/readme.txt
@@ -12,6 +12,8 @@ AI features, experiments and capabilities for WordPress.
 
 The AI plugin brings AI-powered features directly into your WordPress admin and editing experience.
 
+Requires the WordPress Block Editor.  The Classic Editor plugin and other non-Block Editor editing experiences are not supported.
+
 **What's Inside:**
 
 This plugin is built on the [AI Building Blocks for WordPress](https://make.wordpress.org/ai/2025/07/17/ai-building-blocks) initiative, combining the AI Client library and Abilities API into a unified experience. It serves as both a practical tool for content creators and a reference implementation for developers.
@@ -121,6 +123,16 @@ The plugin itself is free, but you'll need to pay for API usage from your chosen
 
 Absolutely! The plugin is designed for content creators and site administrators. Once your AI Connectors are configured, you can use the AI functionality directly from the post editor.
 
+= Does this plugin support the Classic Editor? =
+
+No.
+
+The AI plugin currently supports only the Block Editor (aka Gutenberg).  The plugin is designed around modern editor APIs, block-based content workflows, and the evolving editing capabilities being developed within WordPress core (including Gutenberg).
+
+The Block Editor has been the default WordPress editing experience since WordPress 5.0 in 2018 and remains the primary focus of active editor development.  Concentrating development efforts on the Block Editor enables the project to ship new features, experiments, and integrations more quickly while avoiding the complexity of maintaining parallel implementations across multiple editing experiences.
+
+Although the Classic Editor plugin continues to have a large installed base, the Core AI team has chosen to prioritize innovation and experimentation within the Block Editor ecosystem.  At this time there are no plans to add official Classic Editor support.
+
 = Where can I get help or report issues? =
 
 You can ask questions in the [#core-ai channel on WordPress Slack](https://wordpress.slack.com/archives/C08TJ8BPULS) or report issues on the [GitHub repository](https://github.com/WordPress/ai/issues).