diff --git a/ansible/arcodange/factory/docs/adr/20260407-docker-storage-gitea-runner.md b/ansible/arcodange/factory/docs/adr/20260407-docker-storage-gitea-runner.md
index 88116ba..d5c1c52 100644
--- a/ansible/arcodange/factory/docs/adr/20260407-docker-storage-gitea-runner.md
+++ b/ansible/arcodange/factory/docs/adr/20260407-docker-storage-gitea-runner.md
@@ -18,6 +18,28 @@ Gitea Act Runner images (`ubuntu-latest` and `ubuntu-latest-ca`) are frequently
 ## Decision
 We will implement a **hybrid storage strategy** to prevent Gitea Act Runner image deletion while maintaining Longhorn performance:
 
+### Docker Storage Optimization Flow
+
+```mermaid
+%%{init: {'theme': 'base', 'themeVariables': { 'primaryColor': '#333333', 'edgeLabelBackground':'#f0f0f0', 'tertiaryColor': '#e67e22'}}}%%
+sequenceDiagram
+    participant Ansible
+    participant Docker
+    participant ExternalDisk
+    participant GiteaRunner
+    participant Longhorn
+
+    Ansible->>Docker: Configure /etc/docker/daemon.json
+    Docker->>ExternalDisk: Use /mnt/arcodange/docker for storage
+    Ansible->>Docker: Restart Docker
+    Docker->>GiteaRunner: Pull ubuntu-latest-ca image
+    Ansible->>Docker: Pin image (dummy container)
+    Docker->>GiteaRunner: Start CI job
+    GiteaRunner->>Longhorn: Use persistent storage (unaffected)
+    Docker->>ExternalDisk: Store images (413G free)
+    Docker->>Docker: Skip garbage collection (pinned)
+```
+
 ### 1. Pin Critical Images
 Use a dummy container to pin the Gitea Act Runner images:
 ```yaml