diff --git a/README.md b/README.md
index 0fb388a84..a8f98203a 100644
--- a/README.md
+++ b/README.md
@@ -230,6 +230,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Ship Release Extension | Automates release pipeline: pre-flight checks, branch sync, changelog generation, CI verification, and PR creation | `process` | Read+Write | [spec-kit-ship](https://github.com/arunt14/spec-kit-ship) |
 | Spec Critique Extension | Dual-lens critical review of spec and plan from product strategy and engineering risk perspectives | `docs` | Read-only | [spec-kit-critique](https://github.com/arunt14/spec-kit-critique) |
 | Spec Diagram | Auto-generate Mermaid diagrams of SDD workflow state, feature progress, and task dependencies | `visibility` | Read-only | [spec-kit-diagram-](https://github.com/Quratulain-bilal/spec-kit-diagram-) |
+| Spec Impact | Blast radius analysis for spec changes — show what breaks before you change a requirement | `process` | Read-only | [spec-kit-impact-](https://github.com/Quratulain-bilal/spec-kit-impact-) |
 | Spec Refine | Update specs in-place, propagate changes to plan and tasks, and diff impact across artifacts | `process` | Read+Write | [spec-kit-refine](https://github.com/Quratulain-bilal/spec-kit-refine) |
 | Spec Sync | Detect and resolve drift between specs and implementation. AI-assisted resolution with human approval | `docs` | Read+Write | [spec-kit-sync](https://github.com/bgervin/spec-kit-sync) |
 | SpecTest | Auto-generate test scaffolds from spec criteria, map coverage, and find untested requirements | `code` | Read+Write | [spec-kit-spectest](https://github.com/Quratulain-bilal/spec-kit-spectest) |
diff --git a/extensions/catalog.community.json b/extensions/catalog.community.json
index c4312d541..e1529ad98 100644
--- a/extensions/catalog.community.json
+++ b/extensions/catalog.community.json
@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-04-10T17:00:00Z",
+  "updated_at": "2026-04-11T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "aide": {
@@ -649,6 +649,39 @@
       "created_at": "2026-03-06T00:00:00Z",
       "updated_at": "2026-03-31T00:00:00Z"
     },
+    "impact": {
+      "name": "Spec Impact",
+      "id": "impact",
+      "description": "Blast radius analysis for spec changes — show what breaks before you change a requirement.",
+      "author": "Quratulain-bilal",
+      "version": "1.0.0",
+      "download_url": "https://github.com/Quratulain-bilal/spec-kit-impact-/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/Quratulain-bilal/spec-kit-impact-",
+      "homepage": "https://github.com/Quratulain-bilal/spec-kit-impact-",
+      "documentation": "https://github.com/Quratulain-bilal/spec-kit-impact-/blob/main/README.md",
+      "changelog": "https://github.com/Quratulain-bilal/spec-kit-impact-/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.4.0"
+      },
+      "provides": {
+        "commands": 4,
+        "hooks": 1
+      },
+      "tags": [
+        "impact-analysis",
+        "blast-radius",
+        "dependency",
+        "risk",
+        "change-management",
+        "traceability"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-04-11T00:00:00Z",
+      "updated_at": "2026-04-11T00:00:00Z"
+    },
     "iterate": {
       "name": "Iterate",
       "id": "iterate",