diff --git a/README.md b/README.md
index 4cbd1f1..8cc2d91 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,260 @@
-# ddns-powerdns-updater
+# PowerDNS DDNS Updater
 
-Hybrid DDNS service for PowerDNS setups. Synchronizes external Infomaniak updates with PowerDNS internal A record management via systemd.
\ No newline at end of file
+Hybrid DDNS service for PowerDNS environments. Automatically synchronizes external Infomaniak DNS updates with PowerDNS internal A record management via systemd service and timer.
+
+## Features
+
+- **Dual DNS Management**: Updates both external (Infomaniak) and internal (PowerDNS) DNS records
+- **Automatic IP Detection**: Fetches current external IP using `ifconfig.me`
+- **Smart Updates**: Only updates records when IP address changes
+- **Comprehensive Logging**: Tracks IP changes and DNS updates with timestamps
+- **Systemd Integration**: Runs automatically as background service with configurable intervals
+- **Multi-Domain Support**: Manages multiple internal PowerDNS domains from single configuration
+- **Error Handling**: Validates IP addresses and handles API failures gracefully
+
+## Architecture
+
+The service consists of four main components:
+
+1. **Main Script** (`pdns-ddns`) - Core logic for IP detection and DNS updates
+2. **Configuration** (`ddns.conf`) - API credentials and domain settings
+3. **Systemd Service** (`pdns-ddns.service`) - Service definition for one-shot execution
+4. **Systemd Timer** (`pdns-ddns.timer`) - Scheduler running every minute
+
+## Installation
+
+### 1. Clone and Setup Files
+
+```bash
+# Create directories
+sudo mkdir -p /etc/powerdns
+
+# Copy files to system locations
+sudo cp pdns-ddns /usr/local/bin/
+sudo cp ddns.conf /etc/powerdns/
+sudo cp pdns-ddns.service /etc/systemd/system/
+sudo cp pdns-ddns.timer /etc/systemd/system/
+
+# Make script executable
+sudo chmod +x /usr/local/bin/pdns-ddns
+```
+
+### 2. Configure Settings
+
+Edit the configuration file:
+
+```bash
+sudo nano /etc/powerdns/ddns.conf
+```
+
+Update the following variables:
+
+```bash
+# Infomaniak API credentials
+INFOMANIAK_TOKEN="your-infomaniak-api-token"
+INFOMANIAK_DOMAIN="your-external-domain.com"
+
+# Internal PowerDNS domains (space-separated)
+POWERDNS_DOMAINS="internal1.com internal2.xyz"
+
+# DNS record TTL in seconds
+TTL=300
+```
+
+### 3. Enable and Start Service
+
+```bash
+# Reload systemd configuration
+sudo systemctl daemon-reload
+
+# Enable and start the timer
+sudo systemctl enable pdns-ddns.timer
+sudo systemctl start pdns-ddns.timer
+
+# Check status
+sudo systemctl status pdns-ddns.timer
+```
+
+## Configuration
+
+### Infomaniak API Setup
+
+1. Log into your Infomaniak account
+2. Navigate to API settings
+3. Generate an API token with DNS management permissions
+4. Add the token to `INFOMANIAK_TOKEN` in the configuration
+
+### PowerDNS Requirements
+
+The script requires PowerDNS with the following tools installed:
+- `pdnsutil` - PowerDNS utility for zone management
+- Proper permissions for the script to modify DNS zones
+
+### Supported Domains
+
+- **External**: Single Infomaniak-managed domain
+- **Internal**: Multiple PowerDNS zones (space-separated in config)
+
+## Usage
+
+### Manual Execution
+
+Run the script manually for testing:
+
+```bash
+sudo /usr/local/bin/pdns-ddns
+```
+
+### Service Management
+
+```bash
+# Check timer status
+sudo systemctl status pdns-ddns.timer
+
+# View recent service runs
+sudo systemctl status pdns-ddns.service
+
+# Check logs
+sudo journalctl -u pdns-ddns.service -f
+
+# Stop/start the timer
+sudo systemctl stop pdns-ddns.timer
+sudo systemctl start pdns-ddns.timer
+```
+
+### Changing Update Interval
+
+Edit the timer configuration:
+
+```bash
+sudo nano /etc/systemd/system/pdns-ddns.timer
+```
+
+Modify the `OnCalendar` setting:
+- Every minute: `OnCalendar=*:*`
+- Every 5 minutes: `OnCalendar=*:*/5`
+- Every hour: `OnCalendar=hourly`
+
+Then reload and restart:
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl restart pdns-ddns.timer
+```
+
+## Logging
+
+### IP Change History
+
+The service maintains an IP change log at `/var/log/ddns-ip-history.log`:
+
+```bash
+# View recent IP changes
+sudo tail -f /var/log/ddns-ip-history.log
+
+# View all changes
+sudo cat /var/log/ddns-ip-history.log
+```
+
+### System Logs
+
+View detailed execution logs:
+
+```bash
+# Follow live logs
+sudo journalctl -u pdns-ddns.service -f
+
+# View recent logs
+sudo journalctl -u pdns-ddns.service --since "1 hour ago"
+
+# View logs with timestamps
+sudo journalctl -u pdns-ddns.service -o short-iso
+```
+
+## Troubleshooting
+
+### Common Issues
+
+**Script fails with permission errors:**
+```bash
+# Ensure proper ownership and permissions
+sudo chown root:root /usr/local/bin/pdns-ddns
+sudo chmod 755 /usr/local/bin/pdns-ddns
+```
+
+**Infomaniak API errors:**
+- Verify API token has DNS management permissions
+- Check domain name spelling in configuration
+- Ensure API token hasn't expired
+
+**PowerDNS errors:**
+- Verify `pdnsutil` is installed and accessible
+- Check PowerDNS service is running: `sudo systemctl status pdns`
+- Ensure script has permissions to modify DNS zones
+
+**IP detection fails:**
+- Check internet connectivity
+- Verify `curl` is installed
+- Test manually: `curl -s ifconfig.me`
+
+### Debug Mode
+
+Run the script manually to see detailed output:
+
+```bash
+sudo bash -x /usr/local/bin/pdns-ddns
+```
+
+### Logs Analysis
+
+Check for specific error patterns:
+
+```bash
+# API errors
+sudo journalctl -u pdns-ddns.service | grep -i error
+
+# IP changes
+sudo journalctl -u pdns-ddns.service | grep "IP changed"
+
+# PowerDNS operations
+sudo journalctl -u pdns-ddns.service | grep "PowerDNS"
+```
+
+## Security Considerations
+
+- Store API tokens securely in the configuration file
+- Limit file permissions: `sudo chmod 600 /etc/powerdns/ddns.conf`
+- Regularly rotate Infomaniak API tokens
+- Monitor logs for unauthorized access attempts
+- Consider firewall rules for PowerDNS management access
+
+## Dependencies
+
+### Required Packages
+
+```bash
+# Ubuntu/Debian
+sudo apt update
+sudo apt install curl jq
+
+# CentOS/RHEL
+sudo yum install curl jq
+
+# PowerDNS (if not already installed)
+sudo apt install pdns-server pdns-tools
+```
+
+### System Requirements
+
+- Linux system with systemd
+- PowerDNS server with `pdnsutil`
+- Internet connectivity for IP detection and Infomaniak API
+- Root or sudo access for DNS modifications
+
+## License
+
+This project is open source. Feel free to modify and distribute according to your needs.
+
+## Contributing
+
+Contributions are welcome! Please ensure any changes maintain compatibility with existing PowerDNS and Infomaniak setups.
diff --git a/ddns.conf b/ddns.conf
new file mode 100644
index 0000000..fb7e84d
--- /dev/null
+++ b/ddns.conf
@@ -0,0 +1,10 @@
+
+# Infomaniak API
+INFOMANIAK_TOKEN="YOUR-API-KEY"
+INFOMANIAK_DOMAIN="YOUR-DOMAIN"
+
+# PowerDNS Domains (space separated)
+POWERDNS_DOMAINS="INTERNAL-DOMAIN1.com INTERNAL-DOMAIN2.com"
+
+# TTL for DNS records
+TTL=300
diff --git a/pdns-ddns b/pdns-ddns
new file mode 100755
index 0000000..188bad3
--- /dev/null
+++ b/pdns-ddns
@@ -0,0 +1,131 @@
+#!/bin/bash
+# pdns-ddns - Updates both Infomaniak and PowerDNS with external IP
+# Speichern als: /usr/local/bin/pdns-ddns
+
+# Load config
+source /etc/powerdns/ddns.conf
+
+# IP History file
+IP_HISTORY_FILE="/var/log/ddns-ip-history.log"
+
+# Get external IP
+EXTERNAL_IP=$(curl -s ifconfig.me)
+
+if [[ ! $EXTERNAL_IP =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+    echo "ERROR: Invalid IP address: $EXTERNAL_IP"
+    exit 1
+fi
+
+echo "$(date): External IP: $EXTERNAL_IP"
+
+# Read last known IP
+LAST_IP=""
+if [[ -f "$IP_HISTORY_FILE" ]]; then
+    LAST_IP=$(grep "IP changed from" "$IP_HISTORY_FILE" | tail -1 | sed 's/.*to \([0-9.]*\)$/\1/')
+fi
+
+# Log IP change if different
+if [[ -n "$LAST_IP" && "$LAST_IP" != "$EXTERNAL_IP" ]]; then
+    echo "$(date): IP changed from $LAST_IP to $EXTERNAL_IP" | tee -a "$IP_HISTORY_FILE"
+    echo "$(date): Previous IPs in last 10 changes:"
+    grep "IP changed from" "$IP_HISTORY_FILE" | tail -10 | sed 's/.*from \([0-9.]*\) to \([0-9.]*\)$/Old: \1 -> New: \2/' || echo "No previous changes found"
+elif [[ -z "$LAST_IP" ]]; then
+    echo "$(date): IP unchanged: $EXTERNAL_IP (first run or no history)"
+else
+    echo "$(date): IP unchanged: $EXTERNAL_IP"
+fi
+
+# Check and update Infomaniak (external)
+echo "$(date): Checking Infomaniak A record for $INFOMANIAK_DOMAIN..."
+CURRENT_RECORD=$(curl -s -H "Authorization: Bearer $INFOMANIAK_TOKEN" \
+    "https://api.infomaniak.com/2/zones/$INFOMANIAK_DOMAIN/records" | \
+    jq -r '.data[] | select(.type=="A" and .source==".") | .target' | head -1)
+
+if [[ "$CURRENT_RECORD" == "$EXTERNAL_IP" ]]; then
+    echo "$(date): Infomaniak A record already correct: $EXTERNAL_IP"
+else
+    if [[ -n "$CURRENT_RECORD" ]]; then
+        echo "$(date): Infomaniak A record needs update: $CURRENT_RECORD -> $EXTERNAL_IP"
+        echo "$(date): Infomaniak change: $CURRENT_RECORD -> $EXTERNAL_IP" >> "$IP_HISTORY_FILE"
+    else
+        echo "$(date): Infomaniak A record does not exist, creating with IP: $EXTERNAL_IP"
+        echo "$(date): Infomaniak created: -> $EXTERNAL_IP" >> "$IP_HISTORY_FILE"
+    fi
+    
+    RECORD_ID=$(curl -s -H "Authorization: Bearer $INFOMANIAK_TOKEN" \
+        "https://api.infomaniak.com/2/zones/$INFOMANIAK_DOMAIN/records" | \
+        jq -r '.data[] | select(.type=="A" and .source==".") | .id' | head -1)
+
+    if [[ -z "$RECORD_ID" ]]; then
+        echo "$(date): Creating new Infomaniak A record..."
+        if curl -s -X POST "https://api.infomaniak.com/2/zones/$INFOMANIAK_DOMAIN/records" \
+             -H "Authorization: Bearer $INFOMANIAK_TOKEN" \
+             -H "Content-Type: application/json" \
+             -d "{\"type\": \"A\", \"source\": \".\", \"target\": \"$EXTERNAL_IP\", \"ttl\": $TTL}" > /dev/null; then
+            echo "$(date): SUCCESS: Infomaniak A record created"
+        else
+            echo "$(date): ERROR: Failed to create Infomaniak A record"
+        fi
+    else
+        echo "$(date): Updating Infomaniak A record..."
+        if curl -s -X PUT "https://api.infomaniak.com/2/zones/$INFOMANIAK_DOMAIN/records/$RECORD_ID" \
+             -H "Authorization: Bearer $INFOMANIAK_TOKEN" \
+             -H "Content-Type: application/json" \
+             -d "{\"target\": \"$EXTERNAL_IP\", \"ttl\": $TTL}" > /dev/null; then
+            echo "$(date): SUCCESS: Infomaniak A record updated"
+        else
+            echo "$(date): ERROR: Failed to update Infomaniak A record"
+        fi
+    fi
+fi
+
+# Check and update PowerDNS (internal)
+echo "$(date): Checking PowerDNS A records..."
+for domain in $POWERDNS_DOMAINS; do
+    echo "$(date): Checking zone $domain..."
+    
+    # Check if zone exists
+    if ! pdnsutil list-zone "$domain" >/dev/null 2>&1; then
+        echo "$(date): Zone $domain does not exist, creating..."
+        echo "$(date): PowerDNS $domain created: -> $EXTERNAL_IP" >> "$IP_HISTORY_FILE"
+        pdnsutil create-zone "$domain"
+        NEEDS_UPDATE=true
+    else
+        # Check current A record - match actual PowerDNS output format
+        CURRENT_IP=$(pdnsutil list-zone "$domain" 2>/dev/null | grep -E "^${domain}\s+[0-9]+\s+IN\s+A\s+" | awk '{print $5}' | head -1)
+        
+        if [[ "$CURRENT_IP" == "$EXTERNAL_IP" ]]; then
+            echo "$(date): PowerDNS A record for $domain already correct: $EXTERNAL_IP"
+            NEEDS_UPDATE=false
+        else
+            if [[ -n "$CURRENT_IP" ]]; then
+                echo "$(date): PowerDNS A record for $domain needs update: $CURRENT_IP -> $EXTERNAL_IP"
+                echo "$(date): PowerDNS $domain change: $CURRENT_IP -> $EXTERNAL_IP" >> "$IP_HISTORY_FILE"
+            else
+                echo "$(date): PowerDNS A record for $domain does not exist, creating with IP: $EXTERNAL_IP"
+                echo "$(date): PowerDNS $domain created: -> $EXTERNAL_IP" >> "$IP_HISTORY_FILE"
+            fi
+            NEEDS_UPDATE=true
+        fi
+    fi
+    
+    # Update if needed
+    if [[ "$NEEDS_UPDATE" == "true" ]]; then
+        echo "$(date): Updating PowerDNS A record for $domain..."
+        if pdnsutil replace-rrset "$domain" @ A "$TTL" "$EXTERNAL_IP" 2>/dev/null; then
+            echo "$(date): SUCCESS: PowerDNS A record updated for $domain"
+            pdnsutil rectify-zone "$domain" 2>/dev/null
+            pdnsutil increase-serial "$domain" 2>/dev/null
+        else
+            echo "$(date): ERROR: Failed to update PowerDNS A record for $domain"
+        fi
+    fi
+done
+
+echo "$(date): DDNS check/update completed"
+
+# Show recent IP history summary
+if [[ -f "$IP_HISTORY_FILE" ]]; then
+    echo "$(date): Recent changes (last 5):"
+    tail -5 "$IP_HISTORY_FILE" | grep -E "(change:|created:)" || echo "No recent changes"
+fi
diff --git a/pdns-ddns.service b/pdns-ddns.service
new file mode 100644
index 0000000..8c0be62
--- /dev/null
+++ b/pdns-ddns.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=PowerDNS DDNS Updater
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/pdns-ddns
+User=root
+StandardOutput=journal
+StandardError=journal
diff --git a/pdns-ddns.timer b/pdns-ddns.timer
new file mode 100644
index 0000000..346d943
--- /dev/null
+++ b/pdns-ddns.timer
@@ -0,0 +1,10 @@
+[Unit]
+Description=Run PowerDNS DDNS update every minute
+Requires=pdns-ddns.service
+
+[Timer]
+OnCalendar=*:*
+Persistent=true
+
+[Install]
+WantedBy=timers.target