diff --git a/host-unicorn.yml b/host-unicorn.yml
index aab0818..5dd3a5e 100644
--- a/host-unicorn.yml
+++ b/host-unicorn.yml
@@ -28,6 +28,7 @@
           - "8880:8880/tcp"   # HTTP portal
           - "3478:3478/udp"   # STUN service
           - "6789:6789/tcp"   # Speed Test (unifi5 only)
+          - "10001:10001/udp" # Used for device discovery.
         volumes:
           - "{{ data_dir }}/unifi-controller/data:/unifi/data"
           - "{{ data_dir }}/unifi-controller/log:/unifi/log"