diff --git a/src/index.ts b/src/index.ts
index 8ac6c04..728cbf6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,7 +6,7 @@ import { prettyJSON } from "hono/pretty-json";
 import { config } from "./config";
 import { API_PREFIX, AUTH_PREFIX, DOCS_PREFIX } from "./constants";
 import { redis } from "./core/RedisClient";
-import { openApiSpec, securityScheme } from "./openapi";
+import { openApiSpec, securityScheme, tenantIdScheme } from "./openapi";
 import { apiRoutes } from "./routes/api";
 import { authRoutes } from "./routes/auth";
 import { configRoutes } from "./routes/config";
@@ -17,6 +17,7 @@ const app = new OpenAPIHono({ strict: false });
 // OpenAPI specs
 app.doc(`${DOCS_PREFIX}/openapi.json`, openApiSpec);
 app.openAPIRegistry.registerComponent("securitySchemes", "API_KEY", securityScheme);
+app.openAPIRegistry.registerComponent("securitySchemes", "TENANT_ID", tenantIdScheme);
 
 // Scalar API Reference
 app.get(
diff --git a/src/openapi.ts b/src/openapi.ts
index 2f6902f..54809bf 100644
--- a/src/openapi.ts
+++ b/src/openapi.ts
@@ -22,10 +22,17 @@ export const openApiSpec = {
 			description: "System-level OAuth2 handshake and callback processing.",
 		},
 	],
-	security: [{ API_KEY: [] }],
+	security: [{ API_KEY: [], TENANT_ID: [] }],
 };
 
 export const securityScheme = {
 	type: "http",
 	scheme: "bearer",
 } as const;
+
+export const tenantIdScheme = {
+	type: "apiKey",
+	in: "header",
+	name: "X-Tenant-ID",
+	description: "The unique identifier for the tenant (user or organization).",
+} as const;
diff --git a/src/routes/api.ts b/src/routes/api.ts
index 3057413..fec6e04 100644
--- a/src/routes/api.ts
+++ b/src/routes/api.ts
@@ -54,7 +54,7 @@ const ErrorSchema = z
 const statusRoute = createRoute({
 	method: "get",
 	path: "/status",
-	security: [{ API_KEY: [] }],
+	security: [{ API_KEY: [], TENANT_ID: [] }],
 	tags: ["Tokens"],
 	request: {
 		headers: z.object({
@@ -72,7 +72,7 @@ const statusRoute = createRoute({
 const tokenRoute = createRoute({
 	method: "get",
 	path: "/token/{provider}",
-	security: [{ API_KEY: [] }],
+	security: [{ API_KEY: [], TENANT_ID: [] }],
 	tags: ["Tokens"],
 	request: {
 		params: z.object({
@@ -97,7 +97,7 @@ const tokenRoute = createRoute({
 const refreshRoute = createRoute({
 	method: "post",
 	path: "/refresh/{provider}",
-	security: [{ API_KEY: [] }],
+	security: [{ API_KEY: [], TENANT_ID: [] }],
 	tags: ["Tokens"],
 	request: {
 		params: z.object({