diff --git a/README.md b/README.md
index 129d69413..782bd938b 100644
--- a/README.md
+++ b/README.md
@@ -211,6 +211,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | QA Testing Extension | Systematic QA testing with browser-driven or CLI-based validation of acceptance criteria from spec | `code` | Read-only | [spec-kit-qa](https://github.com/arunt14/spec-kit-qa) |
 | 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) |
 | Retro Extension | Sprint retrospective analysis with metrics, spec accuracy assessment, and improvement suggestions | `process` | Read+Write | [spec-kit-retro](https://github.com/arunt14/spec-kit-retro) |
 | 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) |
diff --git a/extensions/catalog.community.json b/extensions/catalog.community.json
index f04b37067..dce3c06e2 100644
--- a/extensions/catalog.community.json
+++ b/extensions/catalog.community.json
@@ -941,6 +941,43 @@
       "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/tree/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"
+    },
     "retro": {
       "name": "Retro Extension",
       "id": "retro",
@@ -1331,5 +1368,6 @@
       "created_at": "2026-03-16T00:00:00Z",
       "updated_at": "2026-03-16T00:00:00Z"
     }
+    
   }
 }