diff --git a/docs/TODO.md b/docs/TODO.md
index 54d83da..7bc5b84 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -377,6 +377,11 @@
   - Signaling flow implementation
 - [ ] Connection state monitoring
 - [ ] Unit tests (signaling message exchange)
+- [ ] **Test TURN servers** - Verify NAT traversal for symmetric NAT scenarios
+  - Test connection from different network configurations
+  - Verify fallback to TURN when direct/STUN fails
+  - Monitor ICE candidate gathering and connection state
+  - Test with restricted/symmetric NAT environments
 
 ### Step 2: WebRTC File Transfer (4-5h) ⏳
 - [ ] RTCDataChannel setup (ordered, reliable)