diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cffe164..69da98b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,7 +21,9 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: '9.0.x'
+          dotnet-version: |
+            6.0.x
+            9.0.x
 
       - name: Restore dependencies
         run: dotnet restore
diff --git a/README.md b/README.md
index 99917d0..4bce846 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,40 @@
 
 A minimal, zero-dependency .NET library for generating PDF documents from text and Excel (.xlsx) files.
 
+## Project Scope
+
+MiniPdf's purpose is to convert Excel (`.xlsx`) files to PDF and to create PDF documents programmatically from text, using only built-in .NET APIs.
+
+### Supported Features
+
+| Feature | Status |
+|---|---|
+| Text-to-PDF (positioned and auto-wrapped) | ✅ Supported |
+| Excel-to-PDF (`.xlsx` to PDF) | ✅ Supported |
+| Multiple worksheets (each sheet rendered in the PDF) | ✅ Supported |
+| Basic cell formatting (font size, font color) | ✅ Supported |
+| Page setup options (margins, page size, column padding, line spacing) | ✅ Supported |
+| Input as file path or `Stream` | ✅ Supported |
+| Output as file path, `Stream`, or `byte[]` | ✅ Supported |
+| Zero external dependencies (built-in .NET APIs only) | ✅ Supported |
+| Images in Excel cells | ❌ Not supported |
+| Charts in Excel cells | ❌ Not supported |
+| Cell borders and background fills | ❌ Not supported |
+| Bold / italic / underline font styles | ❌ Not supported |
+| Cell merges | ❌ Not supported |
+| Formulas (rendered as their cached value) | ❌ Not supported |
+
+### Target .NET Versions
+
+| Framework | Supported |
+|---|---|
+| .NET 6.0 | ✅ |
+| .NET 7.0 | ✅ |
+| .NET 8.0 | ✅ |
+| .NET 9.0 | ✅ |
+
+> The library targets `net6.0` and `net9.0`. Any .NET version in that range (7, 8) is compatible via the `net6.0` target.
+
 ## Features
 
 - **Text-to-PDF** — Create PDF documents with positioned or auto-wrapped text
@@ -13,7 +47,7 @@ A minimal, zero-dependency .NET library for generating PDF documents from text a
 
 ### Requirements
 
-- .NET 9.0 or later
+- .NET 6.0 or later
 
 ### Build
 
diff --git a/src/MiniPdf/MiniPdf.csproj b/src/MiniPdf/MiniPdf.csproj
index 2c98185..62c1adb 100644
--- a/src/MiniPdf/MiniPdf.csproj
+++ b/src/MiniPdf/MiniPdf.csproj
@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFrameworks>net6.0;net9.0</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
 
     <!-- NuGet Package Metadata -->
diff --git a/tests/MiniPdf.Tests/MiniPdf.Tests.csproj b/tests/MiniPdf.Tests/MiniPdf.Tests.csproj
index 897a9f8..aa7966a 100644
--- a/tests/MiniPdf.Tests/MiniPdf.Tests.csproj
+++ b/tests/MiniPdf.Tests/MiniPdf.Tests.csproj
@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFrameworks>net6.0;net9.0</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
     <IsPackable>false</IsPackable>
   </PropertyGroup>