diff --git a/Dockerfile b/Dockerfile
index 51da248..9912e8f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,7 @@
 FROM python:3.9
 WORKDIR /v6
 ENV v6host=0.0.0.0
+EXPOSE 5900
 ENV v6port=5900
 ENV v6root=/v6data
 COPY requirements.txt requirements.txt