diff --git a/src/app/[transport]/route.ts b/src/app/[transport]/route.ts
index 5ccdf23..74c5e19 100644
--- a/src/app/[transport]/route.ts
+++ b/src/app/[transport]/route.ts
@@ -16,13 +16,20 @@ interface MintlifySearchResult {
 }
 
 function createKernelClient(apiKey: string) {
+  const headers: Record<string, string> = {
+    "X-Source": "mcp-server",
+    "X-Referral-Source": "mcp.onkernel.com",
+  };
+
+  const projectId = process.env.KERNEL_PROJECT;
+  if (projectId) {
+    headers["X-Kernel-Project-Id"] = projectId;
+  }
+
   return new Kernel({
     apiKey,
     baseURL: process.env.API_BASE_URL,
-    defaultHeaders: {
-      "X-Source": "mcp-server",
-      "X-Referral-Source": "mcp.onkernel.com",
-    },
+    defaultHeaders: headers,
   });
 }