diff --git a/scripts/setup.js b/scripts/setup.js
index 180b1a2..44809d0 100644
--- a/scripts/setup.js
+++ b/scripts/setup.js
@@ -338,6 +338,31 @@ async function registerWithPlc(plcUrl, did, operation) {
   return true
 }
 
+// === PDS INITIALIZATION ===
+
+async function initializePds(pdsUrl, did, privateKeyHex, handle) {
+  const url = `${pdsUrl}/init?did=${encodeURIComponent(did)}`
+
+  const response = await fetch(url, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json'
+    },
+    body: JSON.stringify({
+      did,
+      privateKey: privateKeyHex,
+      handle
+    })
+  })
+
+  if (!response.ok) {
+    const text = await response.text()
+    throw new Error(`PDS initialization failed: ${response.status} ${text}`)
+  }
+
+  return response.json()
+}
+
 // === MAIN ===
 
 async function main() {
@@ -375,7 +400,13 @@ async function main() {
   console.log('  Registered successfully!')
   console.log('')
 
-  // TODO: Initialize PDS
+  // Step 4: Initialize PDS
+  console.log(`Initializing PDS at ${opts.pds}...`)
+  const privateKeyHex = bytesToHex(keyPair.privateKey)
+  await initializePds(opts.pds, did, privateKeyHex, fullHandle)
+  console.log('  PDS initialized!')
+  console.log('')
+
   // TODO: Notify relay
 }