diff --git a/example.env b/example.env
index 25a62359..ae250307 100644
--- a/example.env
+++ b/example.env
@@ -6,6 +6,8 @@ POSTGRES_PASSWORD=changeme
 BUILD_INFO=latest
 
 # Port to expose HTTP service
+# When no hostname is specified, this port will be exposed
+# publicly. For reverse proxying, change to '127.0.0.1:8080'
 PORT=8080
 
 # Directory to store image data