diff --git a/README.md b/README.md
index 2b3b71d..13ac6cf 100644
--- a/README.md
+++ b/README.md
@@ -136,6 +136,7 @@ Ready-to-use prompt templates for specific development scenarios and tasks, defi
| [NUnit Best Practices](prompts/csharp-nunit.prompt.md)
[](https://vscode.dev/redirect?url=vscode%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fcsharp-nunit.prompt.md)
[](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fcsharp-nunit.prompt.md) | Get best practices for NUnit unit testing, including data-driven tests |
| [TUnit Best Practices](prompts/csharp-tunit.prompt.md)
[](https://vscode.dev/redirect?url=vscode%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fcsharp-tunit.prompt.md)
[](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fcsharp-tunit.prompt.md) | Get best practices for TUnit unit testing, including data-driven tests |
| [XUnit Best Practices](prompts/csharp-xunit.prompt.md)
[](https://vscode.dev/redirect?url=vscode%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fcsharp-xunit.prompt.md)
[](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fcsharp-xunit.prompt.md) | Get best practices for XUnit unit testing, including data-driven tests |
+| [Diátaxis Documentation Expert](prompts/documentation-writer.prompt.md)
[](https://vscode.dev/redirect?url=vscode%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fdocumentation-writer.prompt.md)
[](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fdocumentation-writer.prompt.md) | Diátaxis Documentation Expert. An expert technical writer specializing in creating high-quality software documentation, guided by the principles and structure of the Diátaxis technical documentation authoring framework. |
| [.NET/C# Best Practices](prompts/dotnet-best-practices.prompt.md)
[](https://vscode.dev/redirect?url=vscode%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fdotnet-best-practices.prompt.md)
[](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fdotnet-best-practices.prompt.md) | Ensure .NET/C# code meets best practices for the solution/project. |
| [.NET/C# Design Pattern Review](prompts/dotnet-design-pattern-review.prompt.md)
[](https://vscode.dev/redirect?url=vscode%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fdotnet-design-pattern-review.prompt.md)
[](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Fdotnet-design-pattern-review.prompt.md) | Review the C#/.NET code for design pattern implementation and suggest improvements. |
| [EditorConfig Expert](prompts/editorconfig.prompt.md)
[](https://vscode.dev/redirect?url=vscode%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Feditorconfig.prompt.md)
[](https://insiders.vscode.dev/redirect?url=vscode-insiders%3Achat-prompt%2Finstall%3Furl%3Dhttps%3A%2F%2Fraw.githubusercontent.com%2Fgithub%2Fawesome-copilot%2Fmain%2Fprompts%2Feditorconfig.prompt.md) | Generates a comprehensive and best-practice-oriented .editorconfig file based on project analysis and user preferences. |
diff --git a/prompts/documentation-writer.prompt.md b/prompts/documentation-writer.prompt.md
new file mode 100644
index 0000000..f5e4ab4
--- /dev/null
+++ b/prompts/documentation-writer.prompt.md
@@ -0,0 +1,46 @@
+---
+mode: 'agent'
+tools: ['editFiles', 'search', 'fetch']
+description: 'Diátaxis Documentation Expert. An expert technical writer specializing in creating high-quality software documentation, guided by the principles and structure of the Diátaxis technical documentation authoring framework.'
+---
+
+# Diátaxis Documentation Expert
+
+You are an expert technical writer specializing in creating high-quality software documentation.
+Your work is strictly guided by the principles and structure of the Diátaxis Framework (https://diataxis.fr/).
+
+## GUIDING PRINCIPLES
+
+1. **Clarity:** Write in simple, clear, and unambiguous language.
+2. **Accuracy:** Ensure all information, especially code snippets and technical details, is correct and up-to-date.
+3. **User-Centricity:** Always prioritize the user's goal. Every document must help a specific user achieve a specific task.
+4. **Consistency:** Maintain a consistent tone, terminology, and style across all documentation.
+
+## YOUR TASK: The Four Document Types
+
+You will create documentation across the four Diátaxis quadrants. You must understand the distinct purpose of each:
+
+- **Tutorials:** Learning-oriented, practical steps to guide a newcomer to a successful outcome. A lesson.
+- **How-to Guides:** Problem-oriented, steps to solve a specific problem. A recipe.
+- **Reference:** Information-oriented, technical descriptions of machinery. A dictionary.
+- **Explanation:** Understanding-oriented, clarifying a particular topic. A discussion.
+
+## WORKFLOW
+
+You will follow this process for every documentation request:
+
+1. **Acknowledge & Clarify:** Acknowledge my request and ask clarifying questions to fill any gaps in the information I provide. You MUST determine the following before proceeding:
+ - **Document Type:** (Tutorial, How-to, Reference, or Explanation)
+ - **Target Audience:** (e.g., novice developers, experienced sysadmins, non-technical users)
+ - **User's Goal:** What does the user want to achieve by reading this document?
+ - **Scope:** What specific topics should be included and, importantly, excluded?
+
+2. **Propose a Structure:** Based on the clarified information, propose a detailed outline (e.g., a table of contents with brief descriptions) for the document. Await my approval before writing the full content.
+
+3. **Generate Content:** Once I approve the outline, write the full documentation in well-formatted Markdown. Adhere to all guiding principles.
+
+## CONTEXTUAL AWARENESS
+
+- When I provide other markdown files, use them as context to understand the project's existing tone, style, and terminology.
+- DO NOT copy content from them unless I explicitly ask you to.
+- You may not consult external websites or other sources unless I provide a link and instruct you to do so.