diff --git a/gitnexus/src/cli/index-repo.ts b/gitnexus/src/cli/index-repo.ts
index 26bb0eff6..e316a036b 100644
--- a/gitnexus/src/cli/index-repo.ts
+++ b/gitnexus/src/cli/index-repo.ts
@@ -20,6 +20,7 @@ import { getGitRoot, isGitRepo } from "../storage/git.js";
 
 export interface IndexOptions {
   force?: boolean;
+  allowNonGit?: boolean;
 }
 
 export const indexCommand = async (
@@ -45,9 +46,10 @@ export const indexCommand = async (
     repoPath = gitRoot;
   }
 
-  if (!isGitRepo(repoPath)) {
+  if (!options?.allowNonGit && !isGitRepo(repoPath)) {
     console.log(`  Not a git repository: ${repoPath}`);
     console.log("  Initialize one with `git init` or choose a valid repo path.\n");
+    console.log("  Or use --allow-non-git to register an existing .gitnexus index anyway.\n");
     process.exitCode = 1;
     return;
   }
@@ -116,4 +118,4 @@ export const indexCommand = async (
   console.log(`  ${repoPath}`);
 
   console.log("");
-};
+};
\ No newline at end of file
diff --git a/gitnexus/src/cli/index.ts b/gitnexus/src/cli/index.ts
index f798b7756..ca9443d73 100644
--- a/gitnexus/src/cli/index.ts
+++ b/gitnexus/src/cli/index.ts
@@ -36,6 +36,7 @@ program
   .command('index [path...]')
   .description('Register an existing .gitnexus/ folder into the global registry (no re-analysis needed)')
   .option('-f, --force', 'Register even if meta.json is missing (stats will be empty)')
+  .option('--allow-non-git', 'Allow registering folders that are not Git repositories')
   .action(createLazyAction(() => import('./index-repo.js'), 'indexCommand'));
 
 program
diff --git a/gitnexus/test/unit/index-repo-command.test.ts b/gitnexus/test/unit/index-repo-command.test.ts
index d8cba675a..63f502006 100644
--- a/gitnexus/test/unit/index-repo-command.test.ts
+++ b/gitnexus/test/unit/index-repo-command.test.ts
@@ -126,4 +126,14 @@ describe('indexCommand', () => {
     );
     expect(process.exitCode).toBeUndefined();
   });
+
+  it('registers non-git path when --allow-non-git is set', async () => {
+    mockIsGitRepo.mockReturnValue(false);
+
+    const { indexCommand } = await import('../../src/cli/index-repo.js');
+    await indexCommand(['/outside/path'], { allowNonGit: true });
+
+    expect(mockRegisterRepo).toHaveBeenCalledTimes(1);
+    expect(process.exitCode).toBeUndefined();
+  });
 });