diff --git a/extensions/README.md b/extensions/README.md
index a8bda89d4..6971ecd88 100644
--- a/extensions/README.md
+++ b/extensions/README.md
@@ -90,6 +90,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Project Status | Show current SDD workflow progress — active feature, artifact status, task completion, workflow phase, and extensions summary | `visibility` | Read-only | [spec-kit-status](https://github.com/KhawarHabibKhan/spec-kit-status) |
 | Ralph Loop | Autonomous implementation loop using AI agent CLI | `code` | Read+Write | [spec-kit-ralph](https://github.com/Rubiss/spec-kit-ralph) |
 | Reconcile Extension | Reconcile implementation drift by surgically updating feature artifacts. | `docs` | Read+Write | [spec-kit-reconcile](https://github.com/stn1slv/spec-kit-reconcile) |
+| Repository Index | Generate index for existing repo for overview, architecture and module level. | `docs` | Read-only | [spec-kit-repoindex ](https://github.com/liuyiyu/spec-kit-repoindex) |
 | Retrospective Extension | Post-implementation retrospective with spec adherence scoring, drift analysis, and human-gated spec updates | `docs` | Read+Write | [spec-kit-retrospective](https://github.com/emi-dm/spec-kit-retrospective) |
 | Review Extension | Post-implementation comprehensive code review with specialized agents for code quality, comments, tests, error handling, type design, and simplification | `code` | Read-only | [spec-kit-review](https://github.com/ismaelJimenez/spec-kit-review) |
 | SDD Utilities | Resume interrupted workflows, validate project health, and verify spec-to-task traceability | `process` | Read+Write | [speckit-utils](https://github.com/mvanhorn/speckit-utils) |
diff --git a/extensions/catalog.community.json b/extensions/catalog.community.json
index 4ae351250..5d7b60118 100644
--- a/extensions/catalog.community.json
+++ b/extensions/catalog.community.json
@@ -416,6 +416,43 @@
       "created_at": "2026-03-14T00:00:00Z",
       "updated_at": "2026-03-14T00:00:00Z"
     },
+    "repoindex":{
+      "name": "Repository Index",
+      "id": "repoindex",
+      "description": "Generate index of your repo for overview, architecuture and module",
+      "author": "Yiyu Liu",
+      "version": "1.0.0",
+      "download_url": "https://github.com/liuyiyu/spec-kit-repoindex/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/liuyiyu/spec-kit-repoindex",
+      "homepage": "https://github.com/liuyiyu/spec-kit-repoindex",
+      "documentation": "https://github.com/liuyiyu/spec-kit-repoindex/blob/main/docs/",
+      "changelog": "https://github.com/liuyiyu/spec-kit-repoindex/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.1.0",
+        "tools": [
+         {
+            "name": "no need",
+            "version": ">=1.0.0",
+            "required": false
+          }
+        ]
+      },
+      "provides": {
+        "commands": 3,
+        "hooks": 0
+      },
+      "tags": [
+        "utility",
+        "brownfield",
+        "analysis"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-03-23T13:30:00Z",
+      "updated_at": "2026-03-23T13:30:00Z"    
+    },
     "retrospective": {
       "name": "Retrospective Extension",
       "id": "retrospective",
@@ -745,5 +782,6 @@
       "created_at": "2026-03-16T00:00:00Z",
       "updated_at": "2026-03-16T00:00:00Z"
     }
+    
   }
 }