diff --git a/README.md b/README.md
index 0342ef7a..e6026509 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,14 @@ A network firewall for agentic workflows with domain whitelisting. This tool pro
 - **L7 Domain Whitelisting**: Control HTTP/HTTPS traffic at the application layer
 - **Host-Level Enforcement**: Uses iptables DOCKER-USER chain to enforce firewall on ALL containers
 
+## Requirements
+
+- **Docker**: 20.10+ with Docker Compose v2
+- **Node.js**: 18+ (for building from source)
+- **OS**: Ubuntu 22.04+ or compatible Linux distribution
+
+See [Compatibility](docs/compatibility.md) for full details on supported versions and tested configurations.
+
 ## Get started fast
 
 - **Prerequisite:** Docker is running
@@ -117,6 +125,7 @@ sudo awf --help
 - [Logging quick reference](docs/logging_quickref.md) and [Squid log filtering](docs/squid_log_filtering.md) — view and filter traffic
 - [Security model](docs/security.md) — what the firewall protects and how
 - [Architecture](docs/architecture.md) — how Squid, Docker, and iptables fit together
+- [Compatibility](docs/compatibility.md) — supported Node.js, OS, and Docker versions
 - [Troubleshooting](docs/troubleshooting.md) — common issues and fixes
 - [Image verification](docs/image-verification.md) — cosign signature verification
 
diff --git a/docs/compatibility.md b/docs/compatibility.md
new file mode 100644
index 00000000..bec88442
--- /dev/null
+++ b/docs/compatibility.md
@@ -0,0 +1,128 @@
+# Compatibility
+
+This document outlines the supported Node.js versions, operating systems, and other compatibility information for the Agentic Workflow Firewall.
+
+## Supported Versions
+
+### Node.js
+
+| Version | Status | Notes |
+|---------|--------|-------|
+| Node.js 22.x | ✅ Fully Supported | Active LTS (recommended) |
+| Node.js 20.x | ✅ Fully Supported | Maintenance LTS |
+| Node.js 18.x | ✅ Supported | Minimum required version |
+| Node.js < 18 | ❌ Not Supported | Below minimum engine requirement |
+
+The minimum Node.js version is specified in `package.json` under `engines.node: ">=18.0.0"`.
+
+### Ubuntu / Linux
+
+| Version | Status | Notes |
+|---------|--------|-------|
+| Ubuntu 24.04 (Noble) | ✅ Fully Supported | `ubuntu-latest` in GitHub Actions |
+| Ubuntu 22.04 (Jammy) | ✅ Fully Supported | LTS, tested in CI |
+| Ubuntu 20.04 (Focal) | ⚠️ May Work | Not actively tested |
+| Other Linux distros | ⚠️ May Work | Docker and iptables required |
+
+**Note:** The agent container is based on Ubuntu 22.04, which ensures consistent behavior regardless of the host OS.
+
+### Docker
+
+| Component | Minimum Version | Notes |
+|-----------|-----------------|-------|
+| Docker Engine | 20.10+ | Required for container networking |
+| Docker Compose | v2.0+ | Used for container orchestration |
+
+### GitHub Actions Runners
+
+The firewall is tested on GitHub Actions runners with the following configurations:
+
+- `ubuntu-latest` (currently Ubuntu 24.04)
+- `ubuntu-22.04`
+
+### Architecture
+
+| Architecture | Status | Notes |
+|--------------|--------|-------|
+| x86_64 (amd64) | ✅ Fully Supported | Primary development platform |
+| arm64 (aarch64) | ⚠️ May Work | Not actively tested |
+
+## CI Test Matrix
+
+The project uses a matrix testing strategy to ensure compatibility across different configurations:
+
+### Pull Requests
+
+For faster feedback on pull requests, tests run on a minimal configuration:
+- **OS:** `ubuntu-latest`
+- **Node.js:** 22
+
+### Main Branch Pushes
+
+Full matrix testing runs on pushes to the main branch:
+- **OS:** `ubuntu-22.04`, `ubuntu-latest`
+- **Node.js:** 18, 22
+
+This approach balances comprehensive compatibility testing with CI resource efficiency.
+
+## Verifying Compatibility
+
+To check if your environment meets the requirements:
+
+```bash
+# Check Node.js version
+node --version  # Should be v18.0.0 or higher
+
+# Check Docker version
+docker --version  # Should be 20.10 or higher
+
+# Check Docker Compose version
+docker compose version  # Should be v2.0 or higher
+
+# Check Docker is running
+docker info
+```
+
+## Troubleshooting
+
+### Node.js Version Too Old
+
+If you see errors about unsupported syntax or modules:
+
+```bash
+# Install Node.js 22 using nvm
+nvm install 22
+nvm use 22
+
+# Or using apt (Ubuntu)
+curl -fsSL https://deb.nodesource.com/setup_22.x | sudo -E bash -
+sudo apt-get install -y nodejs
+```
+
+### Docker Not Available
+
+If Docker is not available:
+
+```bash
+# Install Docker on Ubuntu
+curl -fsSL https://get.docker.com | sudo sh
+
+# Add your user to the docker group
+sudo usermod -aG docker $USER
+
+# Start Docker service
+sudo systemctl start docker
+sudo systemctl enable docker
+```
+
+## Reporting Compatibility Issues
+
+If you encounter compatibility issues with a supported configuration, please:
+
+1. Check the [Troubleshooting Guide](troubleshooting.md)
+2. Search existing [GitHub Issues](https://github.com/githubnext/gh-aw-firewall/issues)
+3. Open a new issue with:
+   - Node.js version (`node --version`)
+   - Docker version (`docker --version`)
+   - Operating system and version (`cat /etc/os-release`)
+   - Full error message and logs
diff --git a/docs/quickstart.md b/docs/quickstart.md
index 5e418d37..bd375b19 100644
--- a/docs/quickstart.md
+++ b/docs/quickstart.md
@@ -4,9 +4,12 @@ Get started with the firewall in 5 minutes!
 
 ## Prerequisites
 
-- Docker installed and running
-- Node.js 18+ and npm
-- GitHub Copilot CLI (if testing with copilot)
+- **Docker**: 20.10+ with Docker Compose v2 installed and running
+- **Node.js**: 18+ and npm (for building from source)
+- **OS**: Ubuntu 22.04+ or compatible Linux distribution
+- **GitHub Copilot CLI**: (optional, if testing with copilot)
+
+See [Compatibility](compatibility.md) for full version details and tested configurations.
 
 ## Installation